But Leighton, who plays Blair Waldorf in the US TV series, doesn't mind that she hasn't found it just yet.
The Country Strong actress said in the January edition of US Allure magazine: 'It's wonderful to be in love. And it's definitely wonderful to cuddle and have sex and get to experience life with somebody.
'But it's okay if you don't find him and you're 24. You can find it someday.'
Meester can relate to her on-screen character's love for Chuck Bass, who is played by Ed Westwick on the show.
She said: 'I can really relate to it – not necessarily because it's this dramatic, tumultuous relationship, but because the way they love each other is very real, and not for the sake of being dramatic. It's actual love. There's nobody for each other but them.'