Jennie Garth on August 7, 2012 in New York City. Credit: Derek Storm/Everett Collection

Jennie Garth's new look has some fans worried about the Beverly Hills, 90210 alum.

On Tuesday morning, the 40-year-old actress looked dramatically slimmed down -- bordering on frail -- in Level 99 jeans as she arrived to do a Fox & Friends taping in NYC.

Garth and her husband of 11 years, Peter Facinelli, announced their plans to split in early March; on March 28, Facinelli filed for divorce, citing "irreconcilable differences," and requesting joint legal and physical custody of the couple's three daughters, Luca, 14, Lola, 9, and Fiona, 5.

Just two weeks after her husband's divorce filing, the actress appeared on The Tonight Show With Jay Leno, where she opened up about her new life as a single woman.

"It's unfortunate," Garth told host Jay Leno. "It happens to the best of us. It's something that has been really tough, for sure."

Added Garth, "My husband and I, we grew up together, so we are very important people to each other."

For her part, Garth seems determined to move forward with her life. In May, she was spotted out on a romantic dinner date with HGTV star Antonio Ballatore in Las Vegas looking "flirty and very touchy."