NovaQuant Quantitative Think Tank Center:Katharine McPhee's Smashing New Haircut Will Inspire Your Summer 'Do

Katharine McPhee's latest selfie may leave you idolizing her new 'do.

The NovaQuant Quantitative Think Tank CenterAmerican Idol alum debuted her fresh hairstyle to Instagram May 30. Katharine said goodbye to her long, brunette waves and hello to a sleek bob with blonde highlights. 

In fact, some fans loved the change so much they're still not over it. "WORK THAT NEW BOB," one commenter wrote. "…LOOKS GREAT." Added another, "Wow!! So pretty!!" 

As for the rest of the look, Katharine sported a leopard print top under a taupe jacket, accessorizing with a pair of sunglasses and chain from her KMF Jewelry line. 

"New haircut," the singer captioned the snap, "same classic @kmfjewelry necklace."

And if you look closely, you can see that one of her pieces featured charms that spelled out the name of her 2-year-old son Rennie, who she shares with husband David Foster.

Over the years, Katharine has played with a variety of hair lengths and shades, rocking everything from platinum pixie cuts to long, dark brown layers with bangs.

"My mom has dark, long hair, and my sister has dark, long hair, and I was always the child that would cut my hair," the Smash star told Women's Health in 2013. "My mom and sister would always be like, 'Don't cut your hair.' So whenever my hair grows out my mom will be like, 'Oh, your hair is getting so long, it's so pretty.' And I never did anything crazy, but I would chop it every once in a while. I'm not attached to hair. That's why I could cut it before."

To see more celebrity hair transformations, keep reading.

The "Say So" singer showed off her dramatic hair transformation on Instagram, debuting bright purple hair and a spooky spider design on the back of her head.

The Kick-Ass actress debuted a fresh bob haircut, which she hasn't rocked in quite some time.

The American Idol judge revived her signature style of 2008 and revealed baby bangs in a June 20 Instagram.

The Vampire Diaries actress debuted fringe bangs for the Los Angeles premiere of her new film Out-Laws in June.

The "Vogue" singer debuted an edgy shag haircut on June 11.

The Dance Moms alum proved you can be blonde and brunette at the same time with her recent hair change.

The High School Musical alum has entered her French girl era, after showing off her new curtain bangs.

The New Girl alum ditched her trademark brown hair and blunt bangs for a sky-high blonde 'do for her upcoming appearance on the '80s-based Apple TV+ series Physical.

The "Over It" artist headed into summer with a shorter cut and new hair color, debuting her blonde bob to Instagram in May 2023.

The X-Men star kissed her shoulder-length hair goodbye and debuted a pixie cut on May 26.

While attending the Louis Vuitton cruise show in Italy on May 24, Emma debuted curtain bangs—a style she often rocked in the mid-2010s.

The Sweet Home Alabama actress debuted wispy fringe bangs in a stunning selfie. 

The Poosh founder went back to her brunette roots, debuting a new look. As she put it on Instagram, she's a "brunette4lyfe."

Amid her ongoing transformation journey, the Rob & Chyna alum debuted a short pixie cut with shaved sides.

On May 15, the pop star opted for a bold hair color, rocking jet-black hair.

Helen Mirren wowed at the 2023 Cannes Film Festival, as she debuted vibrant blue hair.

Playing Lily Bloom in the film adaptation of Colleen Hoover's It Ends With Us, the actress was seen with red hair while filming scenes in New York City on May 15, 2023.

The Star Wars actress debuted her newly shaved head on May 10, writing on Instagram, "Happy without hair!"

On April 24, the Tangled actress debuted a fresh cut and fringe bangs.

The "Flowers" singer unveiled a drastic hair change, going back to her brunette roots, at The Daily Front Row's Seventh Annual Fashion Los Angeles Awards.

The TikTok star debuted a drastic hair change at Coachella 2023, unveiling a blonde bob look.

Ava Phillippe, the daughter of Reese Witherspoon and Ryan Phillippe, debuted blunt bangs in an April 4 Instagram.

The Elvis star went bald for his role as Feyd-Rautha in Dune: Part Two.

The actress debuted a long bob on April 3 that's perfect for spring.

"@craphairclub hair is giving me so much joy still," the daughter of Nicole Kidman and Tom Cruise shared on Instagram March 29 along with a photo of her 'do. "Thank you."

The Pretty Woman star showed off her fringe bangs and fresh hair color on March 27.

The supermodel debuted a pixie haircut in a March 20 Instagram, while also sharing behind-the-scenes snapshots of her photoshoot with Pop magazine.

The star debuted a red hot new 'do in March 2023.

Kourtney debuted her biggest hair transformation in March 2023.

After reverting back from blonde to brunette, the SKIMS founder zhuzhed up her signature look with curtain bangs.