United Kingdom, May 27 -- Denise Richards has praised her youngest daughter as the "biggest angel with the biggest selfless heart" on her 15th birthday, but admitted she "worries" about her future.

The former James Bond star, 54, has gushed over her daughter Eloise, who was diagnosed with a chromosomal disorder during her younger years, and admitted raising a child with special needs feels "more challenging" the older she becomes.

Denise wrote on Instagram: "Wishing my beautiful Eloise Happy 15th Birthday! I can't believe 15 yrs old already. Having a special needs child in a lot of ways gets more challenging with me worrying more about her future the older she gets. My mom always had said, a special needs child is an angel from God and ...