In the past, Lauren has also been linked to St Kilda players Jason Gram and Sam Fisher and she calls Melbourne's best-known Lorthario, Shane Warne, a friend on Facebook.
Meanwhile, Nadia, 34, broke her silence to the Herald Sun.
The influencer, who shares sons Aston, 3, and Henley, nine months with Jimmy, said she's having a "difficult" time coming to terms with their separation as she also grapples with claims the retired Geelong football player has since moved on with Lauren.
While she steered the conversation away from discussing his new relationship, a friend told the outlet that Nadia discovered Jimmy's new romance with Lauren through text message.
"Although I'm heartbroken, I don't want to comment specifically on what's been reported about Jim's trip to the UK as I don't think that is in anyone's interests," Nadia told the Herald Sun.
"My single focus now is to continue to protect, care and provide for my two beautiful boys as this is a personal matter."
WATCH: The moment Jimmy Bartel is caught sleeping while Nadia is in labour