02/08/2015 07:43 EST | Updated 02/08/2015 07:59 EST

Ariana Grande Is All Grown Up At The 2015 Grammys

Need further proof that Ariana Grande is ready for the style big leagues?

Just take a look at the gorgeous dress the singer wore on the 2015 Grammys red carpet Sunday night:

The "Love Me Harder" songstress turned heads in a white gown that featured strategically-placed cutouts, a silver detail that channeled the best of disco, a slit up to there and a stunning open back. Ariana styled the beautiful dress with white pumps and a slicked back high ponytail.

Joining the 21-year-old brunette beauty was beau Big Sean, who looked quite handsome in a black suit, which contrasted nicely with Ariana's bright gown.

Look at how cute they are together:

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Photo gallery Grammy Awards 2015 Red Carpet See Gallery