He's transformed from eternal bachelor to loved-up family man after welcoming son Eric with partner Lauren Silverman in February this year but former girlfriend Sinitta reveals she's unsure if Simon will ever make it down the aisle.
She says: "I'm not sure if Simon will get married to Lauren. They are very happy, though, and it is nice to see him so in love and settled."
Sinitta, 46, who adopted Magdalena, nine and Zac, eight, during her marriage to Andy Willner in 2007, insists Simon and Lauren will welcome more children together in the future.
She reveals: "Baby Eric is a mini Simon and so adorable. He's crawling and moving around so much. Becoming a father has literally become the making of Simon; it's changed him. I think he and Lauren will definitely have more children. They're both great parents."
Read the full story in this week's Closer magazine – out now