Happy 30th Birthday, Kelly Clarkson!

Kelly Clarkson turns 30 today!

The original American Idol has been churning out the big pop-rock anthems for a decade, and is still very much on top of her game after scoring a US No. 1 with her recent hit 'What Doesn't Kill You (Stronger)'.

"Today I am 30 years old YEAHHHHHHHH!!!!," she posted on Twitter. "I am happy, healthy, and looking forward to my thirties! Have an awesome day everybody!"

Kelly's first LP Thankful, which included the hits 'Miss Independent', 'The Trouble With Love Is' and the yet-to-be-Leona'd 'A Moment Like This', was released in 2003; however it wasn't until 2005's Breakway and the hits 'Since U Been Gone' and 'Because Of You' that she was catapulted to global superstardom.

Her subsequent three albums My December, All I Ever Wanted and Stronger have all hit the Top 2 in the US and the Top 5 in the UK.

Next month she will turn talent show mentor in new ABC series Duets, alongside Lionel Richie.

She will shoot the music video to her next single 'Dark Side' in the US this Saturday (April 28).

Watch Kelly's first American Idol audition, including the moment she swapped places with Randy Jackson, below.

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