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Future boyfriends/girlfriends beware: Liam McDermott is one protective big brother!

Any dates his siblings bring home better be ready to meet Liam. The little guy, 4, is already showing off a tough guy attitude ... though he's got his gentle side, too.

Pregnant Tori Spelling and hubby Dean McDermott took kids Liam and Stella to an LA park over the weekend, where Liam was super sweet as he felt his momma's pregnant tummy. But, the little tyke also showed off a tough side with a mohawk and a face full of attitude!

Spelling announced her pregnancy in April.

Tori and Dean star in a new Funny or Die video in which Tori parodies the show Hoarders ... and what she hoards will surprise you ... and crack you up. Watch the vid after the jump!