March 10, 2015 11:15 AM

Frazer Harrison/Getty

Update March 31: The couple have named their daughter Coco Seymour-Mallon. “Clark and I are madly in love with her and happily hibernating,” Seymour Tweeted Tuesday.

Originally posted March 10: Terri Seymour is a mom!

The TV personality welcomed her first child, a daughter, with her boyfriend, British model Clark Mallon, on Monday, March 9, in Los Angeles, according to Extra.

No further details, including the baby girl’s name, have been released.

“Thank you to everyone for all the lovely well wishes,” Seymour, 40, Tweeted Tuesday evening. “Words can not express the love we feel for our baby girl.”

It wasn’t long after Seymour found out that she was expecting — she announced her pregnancy in September — that new dad Simon Cowell stepped in to offer his services.

“His reaction was really sweet, extremely happy for me, then he turned around to me and said, ‘Of course, I obviously have to be the godfather,’ ” Seymour, who’s Cowell’s son Eric‘s godmother, joked.

Although she had no preference as to the baby’s sex, Seymour was tickled pink to find out she and Mallon, 28, had a daughter on the way.

“Deep down inside, I think I’ve always wanted a baby girl,” she told PEOPLE in January.

Weeks before she gave birth, Seymour was reporting from the Grammys red carpet — where her baby belly got plenty of love. The mom-to-be shared a snapshot of Auntie Kelly Osbourne giving her bump a quick kiss.

— Anya Leon

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