Celebrating her 25th year on this planet, birthday girl Demi Lovato is always cool for the summer, especially because her big day falls in the season full of beachy vacays, poolside parties and general fun in the sun. 

She may only be 25, but Demi's done a whole lot of living in just a quarter of a century. In honor of the "Skyscraper" singer's birthday, we thought we'd go back through the highlights of the former child star's lengthy career.

The feisty star had her first taste of the spotlight when she appeared on Barney & Friends back in the day. Years later, the triple threat rose to prominence in 2008 when she rocked it out in the Disney Channel television film Camp Rock. The same year, Demi released her debut single "This Is Me" which peaked at number nine on the Billboard Hot 100. Her debut album, Don't Forget, debuted at number two on the US Billboard 200 in 2008.

In 2009, the brunette's status when she nabbed the titular role on Disney's Sonny with a Chance sitcom and she released her sophomore album, Here We Go Again.

In late 2010, the big-voiced singer left the show and went to a treatment center to seek help for addiction, an eating disorder, and self-harm. While in treatment, the singer was diagnosed with bi-polar disorder. Upon leaving rehab, Demi went to work on her third studio album, Unbroken, which she released in 2011. The album lead dog, "Skyscraper" was a top 10 on the Billboard charts  and the album's second single, "Give Your Heart a Break," went triple platinum.

The Disney darling then went on to judge The X Factor in 2012 and 2013. In 2013, she released a fourth album, Demi, and her single "Heart Attack," became a sky rocketed up the charts.

Demi's fifth album, Confident, hit No. 2 on the Billboard 200, and "Cool for the Summer" went double platinum.

Of course, those are the many chart-topping things we think are totally rockin' about Demi, but here are 25 reasons why we absolutely love the "Confident" lady, who continues to rock our hearts...

Demi Lovato Instagram

Instagram

Demi Lovato Instagram

Instagram

Demi Lovato Instagram

Instagram

Demi Lovato Instagram

Instagram

Demi Lovato

BKNY / AKM-GSI

Demi Lovato

Carlos Tischler/REX/Shutterstock

Demi Lovato, 2017 Grammys, Arrivals

Jordan Strauss/Invision/AP

Demi Lovato, Time 100 Gala

Dimitrios Kambouris/Getty Images for TIME

Demi Lovato, 2017 Oscars, Vanity Fair After Party

Pascal Le Segretain/Getty Images

Demi Lovato

Celebrity Cruises

Demi Lovato

Getty Images

Demi Lovato

Gade/AKM-GSI

Demi Lovato

Cindy Ord/Getty Images for Sony Pictures

Demi Lovato

Getty Images

Demi Lovato

Allan Bregg / SPLASH NEWS

Demi Lovato, 2017 iHeartRadio Music Awards, Arrivals

Jesse Grant/Getty Images for iHeartMedia

Demi Lovato, LAX

Edwin Merino / MEGA

Demi Lovato

GADE / BACKGRID

Demi Lovato

Matt Winkelmeyer/Getty Images for UCLA Semel Institute

Demi Lovato

Lauren/WWD/REX/Shutterstock

Demi Lovato

Elder Ordonez / Splash News

Demi Lovato, Halsey, Instagram

Instagram/@ddlovato

Demi Lovato, Sorry Not Sorry

Vevo

Demi Lovato, 2017 Grammys, Show, Performance

Kevin Winter/Getty Images for NARAS

Camp Rock, Disney Channel Original Movies, Demi Lovato

Disney Channel

Demi Lovato Instagram

Instagram

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