I've searched for Lark's bikini scene from "In the House" before with no luck. Here it is. Lark looking her best at 6.35 here. Her best swimsuit scene, fairly extended. Notice too how Kim Wayans' wrap keeps changing position, sometimes hiding and sometimes exposing her tummy treasure.
Earlier in the same show, here's more of Kim Wayans showing "it" in a bikini, and Maia Campbell in an unreavealing two-piece (4.22).
Another quick segment, Lark in a one-piece cut away showing navel, 12 minutes in.
Just to be complete, the best view of Kim's belly button is here, 5.15 onwards.
Finally, not from the show, Maia flashes it here.