Professor Green is "quietly" dating Kate Rothschild.
Professor Green
The 32-year-old rapper - real name Stephen Manderson - split from his wife Millie Mackintosh in February 2016 but has now moved on to the millionaire heiress and has been on a string of dates with her.
The pair - who both live in London - have reportedly been "inseparable", although they have been playing down romantic chat.
Speaking to The Sun newspaper about the blossoming romance, a source said: "Kate and Stephen have started quietly dating.
"They've been inseparable the last couple of weeks. Lots of people in the Chelsea scene are talking about it."
Kate split from her husband Ben Goldsmith - with whom she has three children with - in 2012, and is said to not want to go public with her romance with Green yet.
The source explained: "They're very keen to keep it under wraps and insist they are only friends so they avoid any public scrutiny until they are certain it's more than just a fleeting romance."
Since Green and Millie broke up after three years of marriage, the blonde beauty has rekindled her romance with her ex-boyfriend and former 'Made In Chelsea' co-star Hugo Taylor.
A source previously said: "From what Millie is saying it seems more than just a rebound. She's being quite coy about it but she's really excited and loving being around Hugo again. Everyone knows he was her first love and she seems to be falling for him again."
Professor Green has since taken to Twitter to let fans know what he thinks about the rumours.