By peoplestaff225
Updated December 07, 2009 08:00 AM

Almost four years into a relationship with Jenny McCarthy, it is no secret that actor Jim Carrey has developed an unbreakable bond with the actress’ 7 ½-year-old son Evan Joseph. However, in new interviews with Access Hollywood and PEOPLE, Jenny reveals that she has nurtured an equally strong relationship of her own with Jim’s daughter, Jane!

“I’d consider her my daughter,” she says. “I love her to pieces.”

And with Jane and her husband Alex Santana expecting their first child — a baby boy! — on March 3rd, Jenny, who calls herself “an absolute mother-in-law,” is more than ready for the next step!

“I’m soon to be a grandma!” she raves. “So that’s interesting, 37 [years old], I get to be called ‘Grandma.’ I’m going to try to keep in shape and youthful, so ‘Grandma’ sounds pretty good!”

Her first job as Grandma? Planning the baby shower, scheduled to take place next month.

— Anya with reporting by Isley Kasica