Rihanna turned 23 Sunday -- and the pop star celebrated in high style with some very famous friends! Jay-Z, Zac Efron and Snoop Dogg were just a couple of the stars that attended her exclusive birthday bash held at a private home in Beverly Hills, PEOPLE reports.

After performing at the NBA All-Star game in Los Angeles, Rihanna hurried to the house where her party was taking place. Once she arrived, a source tells PEOPLE the singer grabbed a Sprinkles red velvet cupcake with a Barbados flag on the top and then snuck to a back room to celebrate with some close girl friends. When she emerged later to join the main party, she was wearing a pink dress with purple fringe around the bottom.

The source reveals that Rihanna gave Efron and Ryan Phillippe big hugs when she saw them. The pair of Hollywood bachelors reportedly spent the night hanging together. Mary J. Blige hung with pal Jay-Z and "squealed with excitement" when Diddy arrived a little later in the night.