Paul McCartney's biggest regret of the decade.

...is marrying Heather Mills. The Beatles star opened up to Q Magazine that if he had it to do over again he wouldn't marry her, although he is grateful to have another daughter, Beatrice McCartney.

Said Paul, “I suppose the marriage has to be a prime contender for mistake of the decade. These things happen you know? But I tend to look at the positive side, which is that I have another beautiful daughter out of it.”