Pregnant Jamie Lynn Spears has found an unlikely advocate in former U.S. child star LISA WELCHEL. The ex-Facts Of Life star has appeared on U.S. television to hail Jamie-Lynn, 16, as a fantastic role model to other teenage mums. The one-time Disney Mouseketeer, 44, - author of a series of Christian family books - is also adamant she made the right decision to keep the child. She says, "I'm very passionate about wanting to speak out on behalf of this young girl. "She is a role model, but it's not her responsibility to be a role model. That's so much pressure on a 16-year-old. "I'm so proud of her for stepping up and being courageous and taking responsibility for her choices, and I believe she's being a good role model - a good role model in that situation, to choose to have the baby, and I am supportive of her in that situation." Britney's TV star sister shocked the world on Tuesday (18Dec07) when she announced during an interview with OK! magazine she is pregnant with 18-year-old sweetheart Casey Aldridge's child.