Megan Fox has reportedly reunited with Brian Austin Green.

The 'Transformers: Return of the Fallen' actress - who confirmed she was single earlier this month spent last weekend in Las Vegas with her former fiance, with friends insisting they have reconciled.

A source said: "They're definitely together - 100 per cent".

The couple - who were joined on their break by Megan's sister and her boyfriend - were meant to fly out on Friday (26.06.09), but missed their plane and drove instead to the Palazzo hotel, where they had a lavish two-bedroom suite.

A source said: "They didn't arrive until 3 a.m. Saturday morning."

The group were later seen shopping, before lunching at Dos Caminos Mexican restaurant.

They then went to see Mystere by Cirque du Soleil at Treasure Island and finished their evening with a late dinner at Red Square.

Megan - whose on/off relationship with the actor began in 2006 - recently admitted she was scared about the prospect of being single again.

She said: "I'm nervous about being single. It's very scary. I'm looking for a guy who's really honest and funny."