What did Justin Bieber do to surprise these big stars?

The likes of Leonardo DiCaprio and other famous stars were left “stunned”, after Justin Bieber apparently donated $545,000 at a charity gala for AIDS last night.

The amFAR Charity Gala was being held at the Hotel du Cap-Eden-Roc outside Cannes, France this week.

Apparently during the auction a man pledged $545,000, when Justin decided to quietly match the offer.

The generous gesture apparently left the likes of Leonardo Di Caprio, Heidi Klum and Sharon Stone “stunned” by his actions.

Justin was even questioned if he was serious about his pledge to which he told organisers he felt like doing something good.

While that was a big amount, it was nowhere near one bidder, who apparently pledged up to $1 million just to spend some time with the gorgeous Leo.

But it was all worth it, as $38 million was raised overall, which is supposed to be a new record amount for the fancy charity event.