Celebrities have been flooding the social media timelines with lovely messages about Valentine's Day, wishing their fans a sweet day but also sending messages of love to their significant others. So what is Ariana Grande up to today? She is doing her favorite thing with her boyfriend but also remembering her days on Nickelodeon!

She wrote, "happy (cat) valentine's day ✉️ ♡" commemorating her role as Cat Valentine in Sam & Cat.

Miley Cyrus also shared a peculiar photo with Liam Hemsworth, but the message is absolutely adorable.

What else did your favorite stars do to celebrate Valentine's Day? Click through the gallery to see what they did!

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