RELATED: See Steven Seagal’s Daughter, Who’s a Model and Aspiring WWE Star. On Aug. 12, Billy took to Instagram to share a handful of photos of his precious middle child. “Happy sixth Birthday Della Rose! On your birthday, it reminds us of how grateful we are to have you in our lives,” he wrote. “You and your sister have been our quarantine entertainment. There are no other people we would want to be stuck with at home!!! We love you more every day and year.“ae0fcc31ae342fd3a1346ebb1f342fcb Billy shares Della and Remy with 37-year-old Alexis Roderick. The pair got married in July 2015, and Della arrived a month later. Business Insider reports that Roderick worked at Morgan Stanley and Merill Lynch before marrying Billy, but she now focuses on being a mother and equestrian. According to Business Insider, the couple met at a restaurant on Long Island and their relationship started as a friendship. RELATED: See Tom Selleck’s Daughter, Who’s a Model and Pro Athlete. For Alexa’s birthday in December, Billy shared a video of Della singing happy birthday to her big sister on Instagram, and wrote a caption in the voice of his younger daughters. “You have been singing us lullabies since we were born. We are so excited to finally get to sing to you on your birthday. We love you more than words can say!” the caption read. The post also included photos of Alexa with her sisters as babies. RELATED: For more celeb content delivered straight to your inbox, sign up for our daily newsletter. In talking about his younger daughters in 2019, Billy told Rolling Stone that having babies in his later years comes with one major difference. “People think I’m my kid’s grandfather. I take [Della] to school and one of the other parents will go, ‘Oh, your granddaughter’s so cute.’ I just say, ‘OK, thank you,’” he said. “I didn’t know that I would be a father again at this age, but I’m glad I am. They keep you young.” When asked if he’s learned more about women by being a father to three daughters, he said, “All my life’s been women. I was raised by women—my dad wasn’t around. I’ve been married numerous times, and I’ve got three daughters. So, a lot of estrogen in my life.” (Roderick is Billy’s fourth wife. Before Brinkley, he was married to Elizabeth Weber Small and after divorcing Brinkley, he was married to celebrity chef Katie Lee.) He described his own upbringing as “very gentle.” “It was very loving, very warm, and I appreciate that about women,” Billy said. “I see that in my daughters too. I’m gonna bring up these kids who one day will be mothers themselves, and I hope they’re like my mom.” RELATED: See Elvis Presley’s 3 Granddaughters Now.