Megan Fox has turned into a petrol head!

The Transformers actress has developed a need for speed after watching beau Brian Austin Green win the first Toyota Celebrity/Pro Race at the Long Beach Grand Prix this past weekend.

“Megan is really getting into cars and racing because of Brian,” a source revealed.

“She’s seriously considering competing in a race but there is just the issue of insurance. She has so many big-budget projects coming up, it’s hard for her to do anything even remotely dangerous.”

Recent reports claimed Megan, 23, is keen to settle down and start a family.

“Despite her reputation as a Hollywood sex symbol, Megan is actually quite grounded and keen to settle down. She and Brian have discussed the idea of marriage and babies — and both are keen,” a source said.

“Megan says she’d like to be married by the time she’s 25 — and a baby would be a bonus. She’s very maternal and gets on really well with Brian’s son Kassius. She’d love to have a child of her own.”