Contrary to recent reports, Sir Paul McCartney is not making nice with ex-wifey Heather Mills, and Heather WILL NOT be welcome at McCartney's 65th birthday bash on Monday.

The Sun reports that though the one-legged dancing diva's camp has been suggesting that McCartney and Mills are getting on just fine, it simply isn't the case. The "cute" Beatle deals with Mills only when he absolutely has to -- when picking up daughter Beatrice after a visit. A source told The Sun that if Mills tries to swindle her way into the soiree she'll be sent away. So much for friendly exes!