Singer Sean Kingston is reportedly breathing on his own and taking baby steps at Jackson Memorial Hospital in Miami, according to the AP. His condition has been upgraded from critical to serious, which means he must remain in ICU (or an ICU step down unit) under the watchful eyes of critical care nurses and doctors.

Kingston, 21, suffered horrific, life-threatening injuries when his Jet Ski slammed into a low bridge at high speed near Star and Palm islands in Miami over the Memorial Day weekend. He was rushed to Jackson’s Ryder Trauma center and hooked up to a ventilator to assist him with breathing while his collapsed lung healed.

According to the Associated Press:

A publicist for Sean Kingston says the “Beautiful Girls” singer is breathing on his own and walking in a Miami hospital.

Joseph Carozza says his client’s condition has been upgraded to serious more than a week after Kingston crashed his watercraft into a bridge off Miami Beach. A female passenger also was injured.

Kingston has been hospitalized since the May 29 crash. Carozza says Kingston walked Monday morning for the first time since the crash.

In an email, the publicist said Kingston thanks his friends, family and fans for their prayers and well wishes.