Evan Agostini / Invision/AP 1 / 5
Evan Agostini / Invision/AP 1 / 5

Kourtney Kardashian might not have planned to get pregnant, but her step-brother Brody Jenner tells Usmagazine.com that she's ready to be a mom.

"Despite what anybody says about any parent -- whether they see them fit or unfit -- it's not up to them. It's up to her," The Hills star, 26, told Usmagazine.com at a performance of the Moskova Affair in Hollywood Thursday (before his fight with Girl Gone Wild honcho Joe Francis). "And if she feels fit for this, then good for her."

Find out what random food Kourtney and other pregnant celebs crave.

He added that he thinks Kourtney, 30, "will be great" as a mother because "she has always been incredible, great older sister."

See who else is pregnant this season.

Jenner (whose father Bruce is married to Kourtney's mom Kris) said he is excited for the little one to arrive. Added the reality star, "I think it'll be cool to be an uncle."

See adorable photos of celeb baby look-alikes.