Kobe Bryant – and His $25K Watch – Play Ball for Charity
03/22/2013 AT 06:00 AM EDT
Kobe Bryant was announced as the new ambassador of Swiss luxury watch brand, Hublot, at the London Hotel in West Hollywood Wednesday night, where the Lakers star's limited edition "King Power Black Mamba" timepiece was unveiled.
Still recovering from his ankle injury, the basketball champ kept score in a charity shoot-off with two children from After-School All Stars Los Angeles and raised $30,000 for the Bryant Family Foundation.
"When the little girl kept missing shots, Kobe lifted her up towards the basket so she could shoot the ball in," an onlooker tells PEOPLE. "He was super sweet with the kids, and kept giving them high fives and hugs."
Bryant was joined by wife Vanessa – who wore a patterned maxi dress – at the fete, where she spent time chatting with the kids after the shoot-off.
Later in the evening, the couple held court at a star-studded dinner on the rooftop of the hotel. Nibbling on bread, Zac Efron was engrossed in conversation with the Bryants, while Jimmy Kimmel (with fiancé Molly McNearney), Garcelle Beauvais and Brad Goreski noshed on a chilled lobster salad and bone marrow and herb-crusted kobe filet.
"Kobe and Vanessa were very relaxed and comfortable together," the source adds. "They fielded well-wishers and fans with huge smiles."
– Melody Chiu