The former child star flashed a big smile while on holiday in Cabo San Lucas, Mexico over the weekend, as she thanked fans for their birthday messages.
Amanda, who celebrated her 28th birthday on 3 April, shared two images from her sun-soaked vacation via Twitter, adding the caption: "Thank you everyone for all the birthday wishes."
The She's The Man starlet looked fantastic in a simple yellow bikini. She's currently on holiday with her parents Rick and Lynn.
Amanda has been keeping a low profile since completing a stint in rehab for mental health issues, and then returning to her parents' home andcare.
She's now registered as a student at the Fashion Institute of Design & Merchandising. She tweeted on 1 March: "Hi everyone! I'm busy studying at @FIDM but I want to say I love you to my fans! Xoxo Amanda."
Got an iPad or iPhone? Reveal Mag is specially designed to fit!