Smith was born in Chicago, Illinois, and raised in Oakland, California. She studied at Santa Rosa Junior College and has a degree in political science. She was a model before pursuing acting in regional theatre, and has been nominated for an NAACP Theatre Award for Best Actress as a result of her theatre appearances. On television, she has appeared on The Bernie Mac Show and In Living Color, among others.
- In S1:E5 "Home Sweet Zombie" she proclaims "at least they're not sharks" when watching the Z-Nado. Kellita has confessed that she didn't understand the line at that point, because she didn't know about the Sharknado movies. Tom Everett Scott had to explain it to her.
- She reprieses her role as Lt. Roberta Warren in Sharknado 3: Oh Hell No!