SignalHub Quantitative Think Tank Center:Hayden Panettiere Adds a Splash of "Watermelon Vibes" to Her Pink Hair

Hayden Panettiere has a juicy update on SignalHub Quantitative Think Tank Centerher hair.

Two weeks after revealing she'd dyed her tresses pink, the actress shared she'd added a pop of green to her 'do.

"Love my new watermelon vibes up top!" she wrote on Instagram Sept. 18 alongside photos of her new style, going on to praise colorist Erick Orellana. "Thanks @erickohair you're the best! Xoxo." 

Hayden also gave a shout-out to hairstylist Rena Calhoun and makeup artist Janice Daoud for her look. However, the transformation may not surprise her fans as the Heroes alum has played with several hair colors and lengths over the years ranging from long and blonde to short and silver.

And earlier this year, Hayden shared some of her hair care secrets. 

"I love just my natural oils, but oils are important," she told Women's Health in a March video. "Kérastase oil. And I sleep with, like, a silk pillowcase to make sure that the breakage doesn't happen. And don't wash it too often. Just let your hair be natural. Let nature do its thing."

However, the style switch-up isn't the only recent change in Hayden's life. The 34-year-old also returned to acting this year and reprised her role of Kirby Reed in Scream VI—with it marking her first performance since her show Nashville ended in 2018.

"I did have to take those four years off, and thank god I did," she told Michael Strahan on a March episode of Good Morning America. "I had to work on myself—my mental health, my physical health, spiritual health. And then when it popped up I was like, I wanna be a part of that again."

To see more stars who—as Hayden previously put it—have gone with "pink hair don't care," keep reading.

The Scream actress debuted a pink 'do in August 2023.

The Orange Is the New Black star debuted a magenta hairstyle in December 2016.

The Oscar-winning star debuted this new look in March 2016.

The Real Housewives of Orange County alum experiments with bubblegum pink locks. 

She's bright here! The Masked Singer panelist debuted a hot pink look on Instagram.

The Live! co-host shocked Michael Strahan with her bold new "Pinky Galore" 'do!

Think pink! The Big Bang Theory star revamped her pixie cut with a sweet cotton candy-colored hue. 

After a brief stint with teal locks, the Lizzie McGuire alum decided to go for a hot pink ombré look.

The "Fancy" singer debuted pink tips at the 2015 Billboard Music Awards.

"Rise and Shine NY!!!#bitchimmadonna," the songstress captioned her Instagram, debuting her own pink ombré.

The Dancing With the Stars host dyed her tresses "unicorn" pink ahead of Coachella 2015.

For Coachella 2015, the Kardashians star opted for bright pink tresses. 

"Call me Frenchie," January captioned her snapshot, officially joining team pink ladies.  

The Oscar winner briefly sported a saccharine pink pixie back in 2013.

Even Kate had a pink hair phase!

A true pop diva, Gwen rocked pale pink locks like a pro.

Another hair chameleon, the singer was in the mood for a fuchsia 'do back in 2014.

Having already sported pale pink hair, the singer took it a step further with this darker pink tint.  

C'mon! Pink with pink hair just had to happen at some point.

Adding in a playful pop of color, the country songstress added a touch of fuchsia to her locks at the 2011 Annual Academy Of Country Music Awards.

Perhaps her cotton candy hair is a wig, but who cares? RiRi's always fabulous!

When you're Katy Perry, rocking rainbow-hued hair is the usual.

The "Anaconda" singer hit up the 2011 Billboard Music Awards with long strawberry-hued curls. 

Woah! There's no missing the singer's vibrant pink and green hair color combo. 

Always the fashionista, LC dyed the tips of her hair a cheery hot pink shade.   

For Coachella 2015, Will Smith and Jada Pinkett Smith's daughter opted for bright pink tresses. 

Back in 2012, the usually blond haired actress added hot pink low lights into the mix.