Diana Ross celebrated turning 75 at a star-studded party in Los Angeles Tuesday, but another singer appeared to steal the show.

Video from the party shows Ross' daughter, Tracee Ellis Ross, asking the crowd to sing "Happy Birthday" as a big birthday cake rolled out. At one point, Tracee Ellis Ross asks if Beyonce was still at the party to sing the song. The shy singer walks through the crowd for a quick "Happy Birthday" serenade.

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Beyonce gave Diana Ross a hug after the song, and the entire moment was captured on the phones of other celebrity party guests, including Motown founder Berry Gordy, Diddy, DJ Khalid, Khloe Kardashian, Kourtney Kardashian and Kris Jenner People reported.

According to Entertainment Tonight, Beyonce wasn't the only person singing to Ms. Ross.

Robin Thicke and Stevie Wonder sang renditions of “Happy Birthday” on separate occasions for the diva singer.

Diana Ross also brought various guests onstage during her performances, including her family -- son Evan Ross and his wife, Ashlee Simpson, as well as Diddy, Wonder, Thicke, a shy Leonardo DiCaprio and his mother, Irmelin Indenbirken. E! News reported Bette Midler, T.I., Heidi Klum Gayle King and Chris Rock were also at the celebration.