Rod Stewart's daughter KIMBERLY has sparked another potential celebrity feud by making a joke about Sir Paul McCartney's wife Heather Mills McCARTNEY's lost leg.

Leggy beauty Stewart, 26, recently had to apologise to Jennifer Aniston after calling her "homely" in an interview with Blender magazine for its July (05) edition.

And, after smoothing things over with Aniston, who later told Vanity Fair that the comment hurt her feelings, Stewart is on the warpath again - this time taking aim at Mills McCartney, who lost her left lower leg in a 1993 motorcycle accident.

During an interview with Stuff magazine, Stewart was asked to tell a joke, to which she replied, "What has three legs and lives on a farm? Paul McCartney and his wife."