Kate Moss is reportedly "refusing" to be 40.

The supermodel spent New Year celebrating in Jamaica with her husband Jamie Hince. Her friend, singer Grace Jones was also there, and the group partied into the early hours while ringing in 2012.

Kate turns 38 at the beginning of next week, and reportedly told friends while partying over the festive period that she isn't ready to turn the milestone age of 40 in a couple of years.

"Kate wasn't thrilled when one of her inner circle asked about her 40th. She snapped back I'm not f***ing middle-aged. I don't care what age it says on my passport, but I refuse to be 40!'" a source told UK magazine Closer.

"She then partied like a 21-year-old with her hubby Jamie Hince to prove her point."

Kate has daughter Lila Grace with Jefferson Hack. She is now reportedly keen to start a healthier lifestyle in order to expand her family.

"She's now planning a detox so she can start trying for baby number two," the source added.