David Foster's Daughters Have Just One Issue with His Wife Katharine McPhee!

David Foster‘s daughters are opening up about his marriage to Katharine McPhee, one year after the two stars tied the knot.

Sara, 39, Erin, 37, and Jordan, 34, jokingly said that they have only one issue with Kat – how hot she is!

“Our biggest issue with [Katharine] is how hot she is,” Erin told People. “Her body is insane. When she comes over for family Sundays, I’m like, ‘Do not get in a bikini.’ My husband’s always like, ‘Kat, get in the pool!’ And I’m like, ‘Simon…’”

Sara said that all of their husbands “hang on the side ogling her.” Jordan added, “Even my 2-year-old son [Otto].”

David‘s daughters also opened up about how his and Katharine‘s age difference has actually been a positive thing for the family. He is 70 and she is 36.

“Interestingly, the age difference has played a role in a positive way,” Erin said. “Our dad comes from a generation where women are more passive. He is also passive about his feelings. Kat has really pushed him to open up. We could get into a fight, and then Kat‘s like, ‘No, you have to pick up the phone, call your daughter back.’ She’s a facilitator, which is really important. She pushes him to be more emotional and more vulnerable.”

Jordan referenced his four past marriages and added, “Age-appropriate hasn’t worked in the past. So I think this is fine.”

Pictured in the main photo here are Kat and David with his daughters Erin, Amy, and Jordan.

In a post earlier this week, Katharine jokingly revealed the “real reason” why she married David.