Katharine McPhee's son Rennie, 4, adorably enlists her to help "fight bad guys" while he wears his Spider-Man costume. The ...

Katharine McPhee shared a video of her and husband David Foster's son Rennie, 3, making his onstage drumming debut.

Bikini-clad Katharine McPhee flaunts abs while celebrating 40th birthday on boat Katharine McPhee and David Foster’s ‘genius’ 3-year-old son, Rennie, plays drums in stage debut ...

Katharine McPhee and David Foster’s adorable son Rennie just turned four years old, and he just had the sweetest Power Rangers-themed birthday party. However, the lovebirds revealed that they ...

Katharine McPhee and David Foster's son Rennie had a sweet Power Rangers-themed birthday party, but they almost went with a Darth Vader theme.

She also likened Prince Harry’s relationship with Foster to a father and son. “They’re so cute, they’re like father and son,” said McPhee. “We just stay in touch with them.

Katharine McPhee dusts off yellow dress she rocked 14 years ago on 'American Idol' She shared a photo wearing the dress in 2006 and a photo from present day.