The 44-year-old elegantly dressed her blossoming bump in an all-black ensemble as she headed out to Claridge's to celebrate Valentino brand ambassador Carlos Souza's new book.
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Tamara Beckwith is due to welcome her baby boy on November 5
She happily mingled and chatted with a number of friends at the glamorous event, including designer Valentino himself, and his long-term partner Giancarlo Giammetti.
Tamara will welcome her third baby on 5 November. She is already a mum to daughters Anouska, 27, and five-year-old Vivi – and as she exclusively revealed her pregnancy news in an interview with HELLO!, spoke of her delight at expecting another child.
Valentino, Giancarlo Giammetti and Tamara Beckwith
"When you've been lucky to have two gorgeous girls, I think you should be grateful," Tamara told HELLO!. "I would never have had IVF, so I thought that was that."
The socialite, who has been married to construction heir Giorgio Veroni since August 2007, confided that she had suffered two heartbreaking miscarriages before falling pregnant again.
"I am quite matter-of-fact about these things; what will be will be," she said. "I had my eggs looked at and the doctor told me if I really wanted to have a baby I needed to do it properly, but I'm just not one of those girls who could get it together with a chart and an ovulation stick."
Tamara Beckwith with her husband Giorgio Veroni and their daughter Vivi
Tamara also revealed that her eldest daughter Anouska believes the new baby is a gift from Tamara's beloved mother Paula, who passed away in 2011.
"She was like, 'It's a gift from nanny', because mummy's birthday was in November and the baby's due date is 5 November, although they don't let you go to full term at my age. Noushy was adamant it was the best thing for us."