Tori Spelling is ''heartbroken'' by rumours Dean McDermott cheated on her.

The 40-year-old actress, who has four children, Liam, six, Stella, five, Hattie, two, and 15-month-old Finn, with her husband of seven years, is ''completely devastated'' even though she was spotted smiling alongside the 'Chopped Canada' host in Los Angeles on Thursday (09.01.14).

A source told People.com that the former 'Beverly Hills 90210' star is focusing on her kids but admitted: ''She's much more heartbroken than anyone realised. She's flipping out and is completely devastated.''

Dean, 47, was accused of having an affair with a woman he met in Toronto before Christmas but Tori has yet to publicly address rumours their marriage is on the rocks.

The insider said: ''I don't think she even knows what she's going to do right now. But no matter what, she's staying strong for her kids. She's all about her family. She worships those kids.

''I don't know if she's strong enough to leave him right now with everything she's going through and four young kids. She could stay with him or not. God only knows.''