The model looked radiant at a pre-BAFTAs party as she showed off her pregnancy curves for the first time.
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At the InStyle bash – which was attended by a host of famous faces – Erin's cute bump was a talking point.
The judge of The Face has talked in the past of her desire to have a large family, though has never named her partner. The couple live together in New York's West Village.
Though she's keen to keep him out of the spotlight, the 35-year-old did sing his praises in an interview with You Magazine.
"He's funny and interesting and wears a suit every day to work, which seems so exotic and outlandish to me that ironically it makes him my equivalent of wild rock'n'roll," she said.
"He's also easy to love and I hope we'll have a baby – lots of them, if we're lucky – together. It’s a nice feeling to have found The One at long last.
"We have half a dozen godchildren between us, so I like to think we have some idea of what’s required for parenthood."
Erin was epitome of elegance in a floor-length black gown with a jewelled top section, her hair pulled back into a chic up'do.
She was joined at the London party by stars including The Saturdays members Mollie King and Vanessa White and milliner Philip Treacy.