As well as receiving tweets from fans, the ‘Here We Go Again’ singer’s famous friends also took to the social networking site to wish her a happy birthday.
Kim Kardashian shared an Instagram pic of the two blowing kisses and tweeted,
“Happy 20th Birthday DemDem!!!! I love you @ddlovato.”
Her sister Khloe Kardashian also took to Twitter and posted,
"Happy Birthday @ddlovato!!!!!! May glitter rain all around you today! Shine on baby doll!!!! Muah!!!"
Even her ‘X-Factor’ boss Simon Cowell sent his love and jokingly referred to the beauty as a “brat.”
"Happy Birthday Brat (@ddlovato) lots of love. Simon."
Meanwhile, fellow ex-Disney star Miley Cyrus wished the songstress many happy returns.
"I'm sending you lots if x's not wasting time on o's =] have the best day everrrr xxxx," she tweeted.
And we assume Demi's day wouldn’t be complete without a message from her flirting partner One Direction’s Niall Horan, who let slip that the pair are meeting up very soon!
"@ddlovato happy birthday honey! Have a lovely day! See ya soon" the 1D heartthrob wrote.
Happy Birthday Demi, we hope you had a good one!
Written by Jennifer Fletcher
Copyright : MTV Australia