Actress/singer Marianne Faithfull believes Sir Paul McCartney married Heather Mills because he was lonely following the death of his first wife Linda.
The British star claims the reason behind the former Beatle's quick marriage to model Mills was because he did not want to grow old alone.
She says, "He's going through such a terrible time. It's hard to imagine how he got himself into his current mess.
"He wasn't used to sleeping alone. He missed Linda. Poor Paul."
MCCartney and Mills married in Monaghan, Ireland, in June 2002 after a dating for two and a half years.