Shakira at an event on March 27, 2013 Credit: Pascal Le Segretain/

It's only been four months since Shakira, 36, gave birth to son Milan, but The Voice mentor is already feeling the pressure -- and struggle -- to lose the baby weight. She tells the Associated Press in a new interview that the entire weight-loss process has been difficult.

"I still have a long way to go," said the "Beautiful Liar" singer, who recently told Us Weekly she's been doing Zumba workouts to slim down. "I still have a few pounds over to lose, I look decent."

Shakira, who welcomed Milan with boyfriend Gerard Pique Jan. 22, is trying to just enjoy motherhood rather than stress about her post-baby body.

"He's great," she told AP. "He's so mellow, but he's very alert, too. It’s like he knows what’s going on around him. He knows when someone comes in the room or comes out. He’s something.”

The season four finale of The Voice will air Tuesday, June 18.