Kate Walsh Boob Grab -- Grabs Friend's Boobs ... Makes A Splash At Disneyland

Kate Walsh went to Disneyland, but it's hooters that ended up making her day -- as she cupped a pair of boobs on Splash Mountain.

The "Private Practice" actress kept her hands well inside the log flume over the weekend -- and showed full support for the knockers seated in front of her during the ride's signature drop.

Kate seemed unimpressed with the rack, but maybe she's just felt 'em before. Turns out the chick is a friend of hers.

Caution: Riders may get wet.