Britney Spears' 'hot' cameo

Britney Spears looks "hot and blonde" in her cameo appearance in the Pussycat Dolls' new video.

The troubled singer - who has been working hard to get back on track following her alleged breakdown earlier this year - shot her scenes for the girl group's latest track 'When I Grow Up' in California on Wednesday (04.06.08).

A set source said: "It was carefully planned out.

"In the scene shot, Britney is driving in a car. They all wave at each other as they are passing in traffic - that is it. It is genius and you will love it! Of course, Britney looks hot and blonde."

The Pussycat Dolls filmed the part of the scene in a blue convertible Chevy Imapla.

The insider added: "They are singing and in traffic - looking hot.

"It is a very short sequence, but Britney had a lot of fun with it. Britney really likes the Dolls' music and when she saw them on the MTV Movie Awards at the weekend, she was totally down to do the video."

This is not the first time mother-of-two Britney has teamed up with the group.

She once appeared with the Pussycat Dolls as part of a special performance for her older brother Bryan's birthday.