Katharine McPhee and David Foster’s ‘genius’ 3-year-old son, Rennie, plays drums in stage debut

Katharine McPhee and David Foster’s son, Rennie, is already a rock star.

The 3-year-old made his stage debut to show off his wildly impressive drum skims during his parents’ concert at the Kennedy Center in Washington, DC, on Sunday.

“had a VERY special guest join us on stage for the first time #ProudMom,” McPhee captioned an Instagram video of her son’s performance.

Rennie, 3, drummed on during his parents’ concert in Washington, DC. “Had a VERY special guest join us on stage for the first time #ProudMom,” McPhee wrote on Instagram.

Wearing large headphones to protect his ears, Rennie showed off his skills by keeping the rhythm on his mini drum set as McPhee, 39, and Foster, 74, watched in complete awe beside him.

The proud mom later clarified that her son was just drumming along as the couple’s professional drummer led the charge.

“By the way… I hope people realize that JR -the legend-@johnjrrobinson1 -our incredible drummer is drumming & Rennie is only copying to the best of his ability unmic’d,” she explained in the comments section of her post.

“It was cute to watch his first on stage debut.”

Rennie played along with their band’s professional drummer.

Several friends and fans of McPhee and Foster flooded the comments section to praise the little one’s musical abilities.

“This is WIIIIILD!!!” Brooklyn Decker wrote.

“This is simultaneously the cutest and the most incredible thing I’ve seen,” a fan commented.

“Haha omg he’s too good I can’t deal. Bring him to every show!” another begged.

The couple revealed their son’s “genius” talents in January. Instagram/@katharinefoster

“So now he’s GIGGING?? I CAN’T with this fella!!” a third fan exclaimed.

“@katharinefoster My wife and I saw your [sic] guys last night at the Kennedy Center! What an incredible show! Your beautiful son was the cherry on a great sundae!!!” one more netizen added.

The “American Idol” alum first revealed Rennie’s drumming talents when she posted an Instagram video of her husband watching their son play the instrument in January.

They celebrated his 3rd birthday at Disney World last week. katharinefoster/Instagram

“my 2 year old baby is a genius!” she captioned the post at the time.

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The couple celebrated Rennie’s 3rd birthday with a family trip to Disney World last week.

“We went on every ride you could possibly go on,” McPhee shared in an Instagram video on Feb. 22. “We got to meet Mickey, my son was surprisingly unafraid to meet him…We got to see the end of this amazing musician’s set.”

McPhee and Foster married in 2019. They welcomed Rennie in 2021. Instagram/@katharinefoster

The actress shared that they also enjoyed pastries, adding, “I had about like 10 churros. I’m not kidding.”

“My son just had a great time drumming his way through the park,” she added.

McPhee and the composer, who have a 34-year age difference, tied the knot in 2019 and welcomed their son nearly two years later.

Foster is also a father to five daughters from previous relationships. davidfoster/Instagram

Last October, the Broadway star said the secret to their successful marriage was therapy.

“I really feel like you can talk through most everything, but you have to have the language, the vocabulary to do that,” she shared at the time. “So that takes practice and self-awareness and having skills to facilitate those conversations.”

McPhee was previously married to Nick Cokas from 2008 to 2016. Meanwhile, Foster has been married five times and has five daughters from previous relationships.