updated 05/24/2012 AT 10:55 AM ET
•originally published 05/24/2012 AT 10:10 AM ET
Joshua Jackson helped Prince Albert and former President Bill Clinton raise more than $750,000 for their respective foundations Wednesday night at the first-ever “Nights in Monaco” benefit dinner in Monte Carlo.
Benefit officials said the Fringe star, 33, accompanied by his longtime love, Diane Kruger, won a necklace by designer Carla Amorim with a bid of $45,000. The “Boreal” necklace is made with 11.7 carats of white diamonds set in 18k rose gold.
Jackson was reportedly overheard saying it was an engagement present for her. Sources close to the couple, however, say engagement buzz is not true.
Jackson and Kruger, 35, who wore a cream-colored Prabal dress, and Rose McGowan, wearing Monique Lhuillier, were among the celebrities who drove in from the Cannes Film Festival for the dinner at the Hotel de Paris.