The 36-year-old pregnant model was pictured affectionately cradling her bump as she posed for photographs before entering the Jean Paul Gaultier show.
Dressed in an orange and blue checked shirt and billowing black trousers, Erin laid a hand protectively on her growing stomach. She wrapped up warm with a black coat and completed her edgy look with a leather head band and striking gold necklace with a pendant of an eye.
Once inside the Fashion World of Jean Paul Gaultier: from the Sidewalk to the Catwalk, Erin was joined by other big names including Jade Parfitt and the host himself Jean Paul.
The notoriously private Erin turned heads when she happily posed next to Stephen Gibson, who she is believed to be expecting her child with. The tall, dark and handsome man touched Erin's blossoming bump and gazed adoringly at the English model.
While Erin has kept mum about her past relationships and love life, the brunette beauty recently posted a revelatory message on Twitter, in which she confirmed "Steve" as the father of her unborn child. "Thx for your warm wishes. My partner of many years & father of the baby is the lovely Steve Gibson. :)," she replied to a follower.
@RooWhitty Thx for your warm wishes. My partner of many years & father of the baby is the lovely Steve Gibson. :)— Erin O'Connor (@Erin_O_Connor) February 5, 2014
In a past interview with You Magazine, Erin gushed about her partner who she called "The One" while not actually naming him.
"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."
Another notable guest at the London fashion event was an impersonator of The Queen, who rocked up in a white dress and leather jacket, complete with a tiara and diamond necklace. The reigning monarch's double and Jean Paul joked around and happily posed on the red carpet, much to the amusement of their guests.