Now that she’s in her third trimester, Kym Johnson — who is expecting twins with husband Robert Herjavec! — can’t help but joke about how big her baby bump has gotten over the past few months. “They’re getting pretty big now. I feel them moving around a lot. They’re fighting for room!” the 41-year-old mom-to-be gushed in a new interview.

Despite carrying twins, the Dancing With the Stars pro dancer has been dedicated to staying fit during her first pregnancy, often sharing fun exercise videos on her Instagram page while expecting. “My whole thought on this pregnancy is I’m letting my body do what it needs to do,” Kym told People, adding that she’s been forced to slow down her recent workouts “because my belly is getting so big.” She continued, “After I have the babies, I’ll take my time getting back. I haven’t gained too much weight on my arms or my legs. It does seem to be my belly.”

Kym and Robert — who tied the knot in July 2016 — recently announced they’re expecting a little boy and a little girl and now that Kym knows her babies’ genders, she’s loved getting to know their budding personalities. “When they hear music, they move around!” she said of the twins.

But, Kym has admitted that she’s most eager to see her 55-year-old husband become a dad again to two new bundles of joy. “I’m so excited to see Robert with the babies. He’s already talking to them and singing songs at night so I’m sure they’ll recognize his voice. We can’t wait. It’s such an amazing blessing,” she revealed.

Since the Shark Tank star is already a father-of-three from his first marriage, Kym knows he’s going to be the best dad to their twins. “He’s going to be great, really hands-on… [Robert] is the best,” she exclusively told Closer Weekly in a recent interview.