Credit: Courtesy Selena Gomez

Selena Gomez is smiling again. The "Come and Get It" singer, 21, resurfaced on Instagram late Monday, Feb. 10 for the first time since confirming a secret rehab stay last month. In the snapshot, Justin Bieber's ex smiles at the prow of a ship sailing on rippled water, with an atmospheric mist behind her. The actress-singer smiles in an open denim shirt and wears little-to-no makeup, with her brunette locks worn down. See the latest pics of Selena Gomez here.

Acknowledging her fans and well-wishers, the former Disney star writes: "I've done everything I could to the best of my ability. Thank you for the unconditional love and cyber hugs. You inspire me."

As her rep explained last week, ""Selena voluntarily spent time at Meadows [in Wickenzberg, Ariz.] but not for substance abuse," a rep for the singer confirmed to Us.

She announced in December that she was canceling her Australian tour. "My fans are so important to me and I would never want to disappoint them," she said in a statement. "But it has become clear to me and those close to me that after many years of putting my work first, I need to spend some time on myself in order to be the best person I can be."