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Demi Lovato, Kim Kardashian, Twit Pic

Instagr.am

Demi Lovato sure has grown up into a beautiful young woman, inside and out.

On Monday, the Disney star turned X Factor judge celebrates her 20th birthday. Kim Kardashian posted an adorable Instagram photo of the two brunette beauties blowing kisses at the cam. "Happy 20th Birthday DemDem!!!! I love you @ddlovato," the E! reality star wrote.

Another ex-Disney star, Miley Cyrus, tweeted her well wishes for Demi."@ddlovato happy birthday beautiful," she wrote. "I'm sending you lots if x's not wasting time on o's =] have the best day everrrr xxxx"

The X Factor also tweeted Demi their well wishes on her special day: "we were thinking of getting you a pig named Simon for your birthday… but we figured one Simon is enough ;)"

Simon Cowell himself wrote to the "Skyscraper" singer: "Happy Birthday Brat (@ddlovato) lots of love. Simon"

Lots of love, indeed. Happy Birthday, Demi!