JustinSelena230.jpgJustin Bieber kept it simple when Tweeting a message of support to girlfriend Selena Gomez.

The 17-year-old singer Tweeted Friday morning: "#getwellselena." Bieber's Tweets are usually longer and he's a frequent Tweeter.

Gomez was hospitalized Thursday night for nausea after an appearance on The Tonight Show.

Bieber and Gomez, 18, just got back from a Hawaiian vacation, where they were photographed kissing and embracing in swimsuits on the beach.

Gomez canceled a concert she had planned for Friday night in Santa Monica, California, but Bieber's concert in Saratoga is still on schedule for Saturday night.