Tori Spelling and husband Dean McDermott are expecting Baby No. 3 this year, and the actress says her timing couldn't have been better.

"I found out on Valentine's Day," she told PEOPLE, adding that it was "it was perfect timing" to deliver the good news to McDermott.

"I wrapped up the pregnancy test in a box and bow and gave it to Dean as his Valentine's Day gift," Spelling, 37, said. "He was beyond surprised. Best gift ever!"

But it was the couple's young son Liam, 4, who knew something was up before anyone told him that he's going to have a new sibling.

"Liam kept saying, 'Your belly is getting huge. That means there's a baby in there,'" said Spelling.