She's not there: Katherine Heigl nowhere to be seen on set of Grey's

Katherine Heigl has not been seen back on the Grey's Anatomy set.

Heigl, 31, who recently adopted a daughter, was set to return to work at Seattle Grace aka the Grey's set following three months of maternity leave.

But a People source reports today: "She's not there."

Heigl's tenure on the show came under scrutiny last year. She is an actress known for speaking her mind. Her character, Dr Izzie Stevens, has been to hell and back, going from terminal cancer and a bed at Grey's to life in a trailer home in just a few episodes.