While most celebs were at Coachella in the desert, Rihanna hit a concert in Hollywood on Saturday night.

The singer was at MyHouse to watch Kid Cudi perform. "They're friends," a source tells E! of her appearance at his show.

In true VIP fashion, he waited for Rihanna to arrive around 1 a.m. before starting his performance.

"She was hanging with her girls, singing and dancing along to the jams and looked like she was having a great time," a source says.

She wasn't the only celeb in the club that night...

Jessica Alba and Cash Warren were there hosting a surprise birthday party for their friend Baron Davis.

It was a rare late night out for the two parents, who celebrated with champagne and stayed at the club until last call.

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