Russell Brand has been dating his latest squeeze for "a few weeks".

The British comedian is officially single following his divorce from Katy Perry and has already moved on.

He has been spotted out and about with brunette beauty Isabella Brewster, whose older sister is actress Jordana Brewster.

"It's been going on for a few weeks," said a source. "He really likes her."

Russell and Isabella became an item before his divorce was finalised, but that hasn't stopped them growing close. She is said to be smitten with her 37-year-old beau.

"She's cute. She is all over him and Russell loves it," the source added.

Katy is rumoured to be dating Florence plus the Machine guitarist Rob Ackroyd, with rumours they are even planning to set up home together in Los Angeles soon.

Recently, she appeared to dismiss speculation their romance is anything major.

"There are times I go out and meet people and flirt, but it's not really appropriate to have anything serious," she said.