Bella Thorne dons red and white dress while celebrating Christmas with her boyfriend and family in London

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Bella Thorne got into the Christmas spirit by donning a puff-sleeved red-and-white dress in an Instagram slideshow she captioned: 'I'm coming for [your] throne Mrs. Claus!'

The 25-year-old former child star - who boasts 52.9M social media followers - paired her plunging silk-and-lace gown with purple sparkly Fendi platform heels. Bella (born Anabella) was already "obsessed" with her brand new diamond bracelet, which she showed off via Instastory.

Thorne got a kiss on the jaw from her boyfriend, Bad Vegan executive producer Mark Emms. The Florida-born, half-Cuban redhead was first pictured canoodling with Mark on August 27 while yachting off the coast of Mykonos.

Emms is Bella's first public romance since splitting with her ex-fiancé - B3N frontman Benjamin Mascolo - on June 2 after three years of dating.

On Christmas morning, Thorne and her man wore matching Christmas PJs to open their presents beside the tree while vacationing in London.

Joining the Thorne jewelry founder in England was her mother Tamara Thorne-Gould, big brother Remington Thorne, and big sister Dani Thorne.