Celebrity couplings often seem like a bit of a revolving door of who's now dating who.

And it appears Kirsten Dunst, 26, has got over her failed romance with Razorlight rocker Johnny Borrell, after she was seen enjoying a date with actor Justin Long, Drew Barrymore's ex-boyfriend.

Kirsten and Justin, 29,  were spotted having lunch at the Chateau Marmont in Los Angeles on the weekend.

And it appears she found the comic actor a barrel of laughs as she smiled and laughed her way through the entire meal.

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Funny guy: Kirsten Dunst seems enraptured by new love Justin Long as the two enjoyed lunch at the Chateau Marmont in Hollywood on the weekend

Justin is better known for dating actress Drew Barrymore. The pair famously declared their love for one another on The Oprah Winfrey show. But split soon after last July.

At the time, he said Barrymore was: 'Beauty and light, and she shines it on everybody who comes into contact with her.'

However, soon after he split from the 'heartbroken' Charlie's Angels' star, he was spotted with hanging out with Kirsten in New York.

And more recently, a source told the New York Daily News: 'Justin and Kirsten were making out hard-core while waiting in line for margaritas.

'They were holding hands and were all over each other.'

The 26-year-old actress, who has dated Jake Gyllenhaal, Josh Hartnett and Orlando Bloom has recently finished a stint in rehab where she was treated for depression.

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Revolving door: Justin is better known for dating actress Drew Barrymore