Lindsay Lohan’s BF Calum Best is set to take a DNA test to see if he is the dad of a model’s baby.

The twenty-six year old has demanded proof that he fathered five month old Amelia, the daughter of twenty-four year old model Lorna Hogan.

Calum admitted to being a sex addict earlier this week after photos of a cocaine-filled orgy with a couple of hookers hit the British tabs.

He has vowed to go into rehab — saying it was his “wake-up call”.

“I’m in contact with the mother and we’ll do a paternity test as soon as possible. I guess if I am a dad then I need to take responsibility,” Calum said of the paternity issue.

Lorna says she was left pregnant following a roll in the hay with the infamous playboy the night before his dad’s memorial service in Manchester last year.

She learned she was expecting two weeks later — but claims that Calum turned nasty when she delivered the news.

Lorna said: “It was never planned, but that’s no excuse for him to abandon the baby.”

She said Calum had sent her a text message demanding a DNA test.

But Lorna said: “I’ll give him all the proof he needs.

“There’s no doubt Calum’s her father. Amelia even has the same shaped face, chin and ears.”