Five years into their relationship, Simon Cowell and his girlfriend, Terri Seymour, are still going strong, so why ruin a good thing? The Extra correspondent tells OK! not to look for an invite in the mail.

“We’re not going to get married,” Terri tells OK!. “We’re very happy as we are.”

Marriage may not be in their future, but family is — for the most part. The 33-year-old hopes to hear the pitter-patter of little Terri and Simon feet eventually, but the acid- tongued American Idol judge, 47, may need some convincing.

"He’s never wanted kids, but I do. I want kids somewhere down the road."

Can you see Simon as a dad?

These two are only one several celebrity couples featured in OK!’s countdown of happily unmarried pairs. For the complete story, check out the next issue — on sale Thursday.

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