Pinault and Hayek
Are Salma Hayek
and former fiancé Francois-Henri Pinault back together – or just friendly exes?
The couple announced the end of their 16-month engagement
in July, but the two stuck close together – and were all smiles – as they attended a birthday party on Saturday.
"She stayed by his side almost the whole time," a party guest told PEOPLE of Hayek, 42, who also brought along Valentina Paloma, her 11-month-old daughter with Pinault, to the celebration for Stevie Wonder's 7-year-old son Kailand Morris. "It was so cute – Francois-Henri was carrying the baby, smiling, and playing with her. He obviously adores Valentina."
Pinault was spotted relaxing on a yacht with a woman in Italy late last month
, but the French billionaire, 46, looked comfortable and happy to be back by Hayek's side as the two noshed on sushi and fruit salad in the sunshine.
The party had a tennis and Olympics theme and was thrown at a country club in Pacific Palisades, Calif., by Kailand's mom and Stevie Wonder's wife, Kai Milla Morris, who even sprang for a very special birthday surprise: The Jonas Brothers made a brief appearance to serenade him with "Happy Birthday."
All three Beckham boys – Brooklyn, 9, Romeo, 6 and Cruz, 3 – enjoyed the party sans their famous parents, with Brooklyn spending hours on the tennis court hitting balls while Cruz put on another break-dancing show
during a kids' dance-off.