Sir Paul McCartney and Heather Mills could be expecting another baby, the Sunday Mirror claims today.

Friends have told the newspaper that Heather is almost three months pregnant, and is waiting for her three-month scan before she announces the news.

McCartney is planning a tour of the US in the autumn, but has apparently delayed an announcement because of the baby.

A source told the newspaper, "Paul was all set to go on a US tour. Following his successful appearance at the Superbowl at the end of January, plans were put in place to announce the massive US tour the following month. But that hasn't happened so far."

The couple already have one child together, Beatrice, who is 16 months old.