Tori Spelling is expanding her brood to five.
The former Beverly Hills 90210 actress is pregnant with her fifth child with husband Dean McDermott.
'It was a total surprise,' Spelling tells PEOPLE. 'But we always wanted a big family. I’m really excited.'
She added: 'Dean was saying, "We just got Finn out of diapers; I thought we were in the clear!" ' says Spelling, 43. 'For the first time this year, they’re all in school. So it’s like, wow. We’re basically starting over.'
Despite this, Spelling says it's perfect timing.
'This baby happened at the best time,' says Spelling. 'Nothing is ever perfect, but I’m so madly in love with my husband and with our kids. The idea of adding to that is such a blessing.'
The pair are already parents to Liam, 9, Stella, 8, Hattie, 5 and Finn, 4. Dean also has an 18-year-old son, Jack, from his previous marriage.