Singer 50 Cent ensured Jim Carrey's 47th birthday was an event to remember by inviting him to join him onstage during a live performance. Carrey celebrated his big day by catching the rapper's performance at Sundance Film Festival's Vitaminwater house in Park City, Utah, on Saturday night. The birthday boy, along with his actress girlfriend Jenny McCarthy, headed directly for the balcony where the star was performing with his hip-hop group G-Unit, reports the New York Daily News. A source tells the newspaper, "Jim and Jenny were dancing and really getting into the music, so 50 decided to bring him out to the balcony for a special rendition of 'In Da Club' (which repeats the line "It's your birthday"). "When Fiddy told the crowd, 'I have a very special guest for you,' everyone was floored because he had just done a duet with Robin Thicke. They thought the surprises were over. Then 50 started singing and Jim appeared, and the crowd just lost it."