The source says Cowell wants his former fiancee, makeup artist Mezhgan Hussainy, as well as longtime girlfriends, Terri Seymour and singer Sinitta, to be bridesmaids at the bash.
“They're planning an intimate ceremony with a yacht reception in Barbados between Christmas and New Year's. Simon wants to be married by the time Lauren delivers the baby – a boy he's already referring to as Simon Jr. – in February,” said a source.