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Coachella Music Festival, Robert Pattinson

AKM-GSI

Robert Pattinson played the part of proud beau as he watched his girl FKA twigs take the stage at the 2015 Coachella Festival.

The 28-year-old Twilight alum was spotted in the crowd as she performed on Saturday, day 2 of the double weekend annual event in Indio, California.

The two later reunited offstage at an after party, the Moschino Late Night event with Jeremy Scott, sponsored by DeLeón Tequila.

Pattinson and the singer began dating last fall and source told E! News earlier this month that they are engaged. FKA Twigs, whose real name is Tahliah Barnett, was not spotted wearing an engagement ring at the after party, an eyewitness told E! News.

The two shared a few kisses while chatting with friends, E! News has learned.

"They spent most of the time talking to other people but when they were together they were really cute," the witness said about FKA Twigs and Pattinson. "You can tell they're really happy together."

Coachella Music Festival, FKA Twigs

Matt Cowan/Getty Images

Katy Perry, Pattinson's old karaoke buddy, also attended the party. The witness told E! News that the pop star showed up late with a huge posse, all decked out in Moschino and spent most of her time in the corner near the DJ booth.

Perry and Pattinson had also hung out together at Coachella in 2014.

Other celebs spotted at the bash included Fergie and Alexa ChungZoë Kravitz. Guests enjoyed food catered by Eveleigh, a Los Angeles restaurant that specializes in American and European country cooking.

SkrillexDiploDJ Mia Moretti and A-Trak.

See more pics of celebs at Coachella below.