Tori Spelling's mother Candy says her daughter "doesn't feel so great" with her fourth pregnancy.

The reality star conceived her latest child just over a month after having daughter Hattie eight months ago.

But Candy says although she's "thrilled" about becoming a grandmother again Tori and husband Dean McDermott should have had a bigger gap.

"She's expecting on my birthday, September 20," Candy gushed to In Touch. "But it's going to be a cesarean, so she's going to have it earlier."

"She's felt great through all her pregnancies, but she doesn't feel so great through this one."

Candy attributed her challenging health to conceiving six weeks after giving birth to her third child. Hattie joined big brother Liam, five, and sister Stella, four.

"It was a little soon," Candy said. "Her body didn't get back in shape, so I think it's a lot for her!"