A baby bump has sparked rumours that Jodie Foster is pregnant.[Agencies]

Jodie Foster, who recently broke up with her girlfriend after 14 years together, has sparked rumours she is pregnant.

The Brave One actress, who split from lesbian lover Cydney Bernard in May, displayed an apparent baby bump in a tight purple sundress while out in Los Angeles over the weekend.

An onlooker said: "Jodie definitely looked bigger than she usually does. Her stomach was enlarged and her breasts looked as though they had grown as well.

"She was glowing though. She didn’t have any make-up on and she still looked beautiful."

The 45-year-old actress is widely reported to have conceived sons Kit, seven, and 10-year-old Charlie by in vitro fertilisation with the late homosexual film director Randy Stone, who died of heart-related problems in February.

However, Jodie has always refused to disclose her sons' father’s identity.

The actress recently revealed she is pleased she had sons because she found it easier to relate to them.

She said: "Boys are easy. I mean, there are just a lot of bruises when they're young. With boys, you get a lot of accidental jabs in the eye and stepping on your feet, and those tantrums they cause when they don't want to leave the toy store."