06/13/2011 at 03:00 PM EDT
The show must go on.
After being hospitalized
Thursday for nausea and a severe headache, Selena Gomez
seems to be feeling better and back to business, including a rescheduled Santa Monica, Calif., mall show to promote her upcoming movie, Monte Carlo
"Feeling much better, thank you all for being so understanding," Gomez, 18, Tweeted
Monday. "Can't wait to see you all today at Santa Monica Place for the Monte Carlo kick off."
Amid reports she was hospitalized because of blood pressure-related health problems, the pop star had plenty of support from fans – and boyfriend Justin Bieber
, who took to Twitter
to express his concern: "#getwellselena," he said Friday.
A solo Gomez, who was spotted out this weekend in Los Angeles, posted this message to her official Facebook page
: "I just wanted to say thank you so much for all of the get well wishes. I love you guys so much."