Ariana Grande turns 21, ready to compete with the likes of Taylor Swift, Katy Perry and Gaga

The songstress exploded onto the scene this year with her release of the still sizzling hit 'Problem,' which peaked at No. 2 on the Billboard Hot 100 and sold a record-breaking 438,000 downloads in its first week alone, according to Billboard.com. And that's not all.

The petite powerhouse also received some attention from the president this past year, having been invited to perform at the White House concert "Women of Soul: In Performance at the White House" on March 6, as well as the White House Easter Egg Roll on April 21, according to WhiteHouse.gov.

And it looks like she'll have some much-cherished company on her climb to the top this coming year. Grande allegedly reunited with boyfriend, Jai Brooks, 18, in May, according to HollywoodLife.com, and is reportedly 'happier than ever.'

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