Katharine McPhee Shares What She Got for David Foster's 75th Birthday — and It Might Surprise You (Exclusive)

The couple celebrated the music producer's milestone birthday at the Hollywood Bowl on Nov. 3

Katharine McPhee kept things low key for David Foster's birthday.

McPhee, 40, and her music producer husband, who turned 75 on Nov. 1, celebrated the milestone at the Hollywood Bowl on Sunday, Nov. 3. At the event, which was produced by Live Nation-Hewitt Silva and featured performances by McPhee, PEOPLE caught up with the American Idol alum.

When asked about birthday shopping for Foster, McPhee shared, "I think we're sort of past doing extravagant."

"I bought him, like, a cute sweater and a cute jacket," she continued, "just things for him to look chic in."

Despite a lack of extravagance, Foster said he appreciates his wife's gifts. "Oh, she bought me a lot of presents," he told PEOPLE. "She's great. She's been amazing."

He added, "And of course, we have our three-year-old that keeps us busy and gets us up in the morning. So, yeah, it's pretty regular."

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McPhee also celebrated a milestone birthday this year; the singer turned 40 in March.

"I welcomed my 40s," the star told PEOPLE at Foster's birthday celebration, which included stage performances from Kristin Chenoweth, Josh Groban, Jennifer Hudson and Michael Buble. "David didn't have any conversations about, like, ‘Oh, I can't believe I'm 75’ or I didn't say like, ‘oh, I can't believe I'm 40. I'm really mourning that.’ No, we didn't do any of that."

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She continued, "So we're kind of both cut from the same cloth. It's like we sort of just accept life as it comes and we're not fighting getting older, because it just keeps getting better."

Foster agrees. "She's fine, and I don't even think about it either," he said of their recent milestones. "You know, I'm just groovin'."