Beullah "Lisa '' Wilkes, portrayed by Nia Long, was introduced in the fifth - season episode, "Will 's Misery, '' as the girlfriend who tames Will into forsaking his womanizing ways. The two fall deeply in love and are engaged to be married, going so far as the ceremonies twice but never actually tie the knot. The first time, they elope to Las Vegas and try a Shaft - themed wedding but walk out on the ceremony after being interrupted so many times and realizing they were not ready. The second time they try to get married, Will starts feeling some doubts, especially when he notices that, like Jazz, he also knows very little about Lisa, culminating in him asking if Lisa is her real first name, upon which she reveals it 's actually Beulah. Will manages to overcome these doubts but Lisa reveals that she is also having doubts and the two decide not to marry. She is never seen again. The night before the wedding, a rivalry flared up between Will 's mother and Lisa 's father. In order to help them work out their differences before their wedding, Lisa and Will send them to a restaurant to get to know each other and work things out. However, the plan backfires when they get along too well and Will catches them in bed together. Ultimately the two end up getting married at the same ceremony, resulting in Will and Lisa becoming step - siblings.
will smiths girlfriend in fresh prince of bel air
Beullah "Lisa '' Wilkes