The Hollywood couple parted ways in March (12) and they have split custody of their three daughters, Luca, Lola, and Fiona.
The pair has now decided to split the upcoming celebrations - Garth will spend Christmas (25Dec12) with the kids, while her husband has them for Thanksgiving later this month (22Nov12).
But the former Beverly Hills, 90210 star is cooking up an early Thanksgiving meal this weekend (17Nov12) so she won't miss out on the fun with her girls.
She tells Us Weekly, ""We're gonna do our Thanksgiving (with the girls) on Saturday. I'm gonna make a whole meal, have them go shopping with me and help me bake everything, and my mom and her husband are gonna come over.
""This is my first shared holiday. Their dad and I are hammering out the details of that, which is weird. They're actually gonna be with him for Thanksgiving and I'm gonna be with some friends, and then I get to have them for Christmas.""