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Star Sightings: Rihanna Has Epic Dance-Off at Coachella, and More!

Dancing queen!

Rihanna had an epic dance-off with Diddy’s son, Christian Combs, at the VELOCITY BLACK x 1 OAK/Up & Down Desert Beach Club in Indio, California, on Sunday. French Montana, P. Diddy, Cassie, Future, Nicole Scherzinger, and 2 Chainz, and more were on hand to celebrate Rihanna’s brother, Rajad Fenty’s, 21st birthday with cocktails by Absolut Elyx and D'usse, Budweiser beer and food by CATCH.

Matteo Prandoni / BFA

Earlier in the day, Katy Perry hosted an Easter Day "Recovery" Brunch, produced by John Terzian's The h.wood Group, at a private estate during the Coachella Music Festival in Thermal, California. The colorful daytime event featured an exclusive pop-up debut of the Katy Perry Footwear collection, and guests re-fueled with vitamin elixirs, oxygen bars and reflexology massages. The fun activities also included a festive Easter egg hunt by Cover Girl, and beats spun by Mia Moretti, Balthazar Getty and Bobby French.

Rony Alwin

Rony Alwin

On Saturday, Jimmy Fallon, Harry Styles and Saturday Night Live creator and producer Lorne Michaels held an after-party for the ages to celebrate the show's historic, first-ever coast-to-coast live broadcast at New York City hotspot Zuma.

Andy Cohen, Rachel Dratch, Questlove, Steve Higgins, Colin Jost, Beck Bennett, Aidy Bryant, Kyle Mooney, and many more celebrity guests joined the party at Zuma, which is known for its Izakaya-style Japanese cuisine, signature Robata grilled dishes and inventive sushi.

In celebration of the new 2017 Buick Encore, the brand hosted a curated road trip and wellness event, "Buick Encore Backstage Classes," during the first weekend of Coachella at the Ace Hotel and Swim Club in Palm Springs, California. Celebrity fitness trainer Harley Pasternak – whose clients include Lady Gaga, Katy Perry, Kim Kardashian, and Rihanna — and celebrity chef Bo O'Connor shared tips and insights on how some of their A-list celebs stay fit and healthy on the road.

Rodrigo Pena for Buick/AP

Rodrigo Pena for Buick/AP

Also at Coachella, Kaleidoscope Productions and Delta Air Lines hosted "Lawn Talks," a casual day of conversation amongst music's top innovators, pioneers, and legends in music, technology and business during the music festival. The star-studded guest list included Shay Mitchell and speakers Randy Jackson (GRAMMY-winning producer), Jim Zukin (founding partner, Houlihan Lokey), and Noel Lee (founder & CEO, Monster).

Guests sipped on Ciroc cocktails during the event, and were entertained by "The Foodie Magician" Josh Beckerman.

Joe Scarnici/Getty Images for Kaleidoscope

Joe Scarnici/Getty Images for Kaleidoscope

Global pop superstar and platinum songwriter CHARLI XCX, along with opener LPX, entertained guests at PANDORA's 4th Annual Indio Invasion to celebrate the first weekend of Coachella at the Cree Estate in Cathedral City, California.

Michael Bezjian / Getty Images for Pandora

Singer Halsey hopped on the Three Olives "Find Otherness" bus from their desert house in Rancho Mirage, California, and headed to the Saguaro, Palms Springs for a little fun in the sun during Coachella.

David Crotty/WireImage

Joaquin Phoenix and girlfriend Rooney Mara enjoyed a movie date night on Friday, at Universal Cinemas at the Universal CityWalk in Universal City, California. While rumors that they were dating first surfaced earlier this year, the couple remained low-key at dinner, though Phoenix was sporting a disheveled, faded red-orange dye job that was hard to miss.

"He had his arm around Rooney as they waited at the concession stand. They looked cute together like they were having a normal, couple's night out," an eyewitness tells ET. "Rooney seemed to be the one looking around, on alert for anyone who might recognize or spot them, looking around every so often."

Kourtney Kardashian and Scott Disick enjoyed a family fun day bowling with their kids, Penelope and Reign, at Bowlero in Woodland Hills, California, on Thursday.

The group chowed down on fries, and were spotted filming for an upcoming Keeping up with the Kardashians episode. Kourtney and Penelope's sweet bowling names were "Banana" and "Blueberry" while Scott and his youngest son Reign went by "Batman" and "Robin."

The Weeknd, Drake, French Montana, Big Sean, Amber Rose, Travis Scott and more celebrated rapper Belly’s birthday at a private residence in Beverly Hills, California, on Friday, April 7. The group partied until 4 a.m. with Grey Goose cocktails like Le Grand Fizz, High Five, Le Melon Mule and Grey Goose VX.

The "Starboy" crooner threw the bash for Belly, but he only had eyes for his main squeeze: Selena Gomez. The cuddly duo spent most of the night huddled in a corner behind a wall of security. Guests saw the couple showing off some major PDA, and sneaking in and out of the tent throughout the party.

Johnny Nunez

Johnny Nunez

Elsewhere in couples' news on Friday, Maksim Chmerkovskiy and Peta Murgatroyd were spotted leaving a date night at Chin Chin in West Hollywood, California. An eyewitness tells ET that the Dancing With the Stars pros left the restaurant’s back entrance shortly after 7 p.m. The twosome, who recently welcomed a son together, were "touchy-feely" and "intimate,” while leaving the parking lot.

At one point, Maks even pulled Peta in from behind and had his arm around her waist as they walked in unison to a black Mercedes.

Meanwhile, Ireland Baldwin, Debby Ryan and Jeannie Mai attended an intimate dinner hosted by footwear giant UGG and Darling Magazine in the hills of Los Angeles, California. Chef and food blogger Lee Tilghman prepared a three-course organic dinner for guests who participated in intimate conversation led by the magazine’s editor- in-chief, Sarah Dubbeldam, about women’s empowerment, health and wellness, pop culture and the changing seasons.

The event was the latest in a series of regularly hosted dinners by Darling Magazine across the nation, where subscribers and influencers are invited to come together for an evening of conversation over a nice meal. The driving inspiration behind this facet of the Darling Movement is to bring people together to share and express their individual ideas and opinions, whether they have been friends for years or acquaintances for five minutes

Cara Robbins

Fat Joe hit the stage for a performance at Pepsi's New York Yankees Home Opener After Party at Kola House in New York City.

Getty Images/Kola House

Multi-platinum band DNCE dropped by The Brooklyn Bowl in partnership with M&M’s as part of the Spotlight Concert Series.

Stuart Ramson/Invision for M&M'S/AP Images

Dancing With the Stars' Jenna Johnson celebrated her 23rd birthday with a karaoke party at Blind Dragon in Los Angeles. Fellow dancers Sharna Burgess, Keo Motsepe, Artem Chigvintsev and more sang and danced all night and presented the birthday girl with a lipstick ice cream cake from Cold Stone Creamery.

Speaking of birthdays, Victoria's Secret supermodel Josephine Skriver celebrated her 24th birthday a few days early, with her "sister," fellow VS model pal Jasmine Tookes, and a few other model friends at Encore Beach Club inside the Wynn Las Vegas. The blonde stunner and her pretty posse partied in a cabana overlooking the hot pool party action as David Guetta provided the soundtrack for the afternoon from behind the decks.

The bikini-clad birthday girl sipped on champagne as she and her besties took a twirl on Encore Beach Club's Ferris wheel, one of the world's most popular dayclub's elaborate bottle presentations.

Michael Kirschbaum

Star Wars actor Mark Hamill, best known for playing Luke Skywalker, surprised pediatric hospital patients at the launch of Starlight Virtual Reality at the Florida Hospital for Children in Orlando, Florida, on Wednesday, April 12.

Starlight Children's Foundation announced the launch of Starlight VR as well as their collaboration with the program’s founding sponsor, Star Wars: Force for Change, an initiative from Lucas Films that harnesses the power of Star Wars to empower and improve the lives of children around the world. The groundbreaking new program, which is powered by Google, will entertain, educate and inspire the imaginations of hospitalized kids across the U.S. through a one-of-a-kind, immersive experiences.

Hamill visited patients in their rooms as well as interacted with children as they played games, made crafts, went through “Jedi training” and other Star Wars-themed festivities. During the special event, Hamill also presented new Star Wars-themed Starlight Brave Gowns that allow hospitalized kids to transform into their favorite Star Wars characters, including Princess Leia, R2-D2, Chewbacca and Darth Vader.

Renowned designers Dean & Dan Caten -- the forces behind DSQUARED2 -- and international superstar Ricky Martin commemorated the opening of the brand’s newest flagship boutique at The Shops at Crystals in Las Vegas on Thursday, April 6. The iconic duo created all of the costumes for Ricky’s new residency at Park Theater, Ricky Martin: All In, which debuted the night before.

Denise Truscello/ WireImage/Getty Images

Estelle performed at the 20th Annual Dress for Success Gala, at New York City's Cipriani, where the company announced its Open Door Project Initiative.

Getty Images