Emilia Clarke's ''best night of [her] life'' was when Brad Pitt tried to buy a date with her.

The 31-year-old actress was overwhelmed with excitement when the 'Moneyball' star placed a bid to view an upcoming episode of 'Game of Thrones' with her during a silent auction at Sean Penn's annual gala for Haiti, at Milk Studios in Los Angeles, California, in January - but he ultimately lost out to a higher offer.

Speaking on 'The Graham Norton Show' she explained: ''There was an auction for a charity do that I was asked to take part in so I offered time with myself. As the bidding started I realised Brad Pitt was trying to buy me. I looked across the room and he had his paddle up! Sadly, he was outbid and it didn't work out.''

The 'Fury' actor saw his $120,000 bid at the auction dwarfed by that of an unnamed purchaser, who paid $160,000 for the experience.

Brad had initially bid $80,000 before upping his offer to $90,000.

When another 'Game of Thrones' star, Kit Harington - who had been seated at a separate table to Emilia - returned to the room after a bathroom break, he also offered to sit in on the episode viewing, prompting the 54-year-old actor to again raise his bid to $120,000.

However, the exciting lot was won by the other attendee.

Meanwhile, Emilia outbid Leonardo DiCaprio - who was honoured at the gala for his work combating climate change - for a painting by Josh Smith, paying $90,000 to trump his $80,000 offering for the artwork.

However, later during the auction, a second painting by the artist was put up for grabs, and this time around, the 'Wolf of Wall Street' star was successful.

The winner of the 'Game of Thrones' prize will have to wait some time for their screening because it was recently confirmed the HBO fantasy drama series won't return to TV for its final season until 2019.