by Breaking Celebrity News Staff

Just two days after losing primary custody of her daughter, Amber Portwood partied almost until dawn to celebrate her 21st birthday.

The Teen Mom star was joined by boyfriend/ baby daddy Gary Shirley and a few other friends at Jimbo's Bar in their hometown of Anderson, Indiana where the group reportedly pounded drinks and danced into the early hours.

Amber got appropriately dressed up for the occasion in a black skirt and white shirt which she paired with white wedge heels but the TV star looked a little worse for wear as she was helped out of the bar at the end of the night.

As Breaking Celebrity News previously reported, Amber lost primary physical custody of her daughter Leah on Wednesday after recent vandalism of her home and car put the two-year-old's saftey in question.

"Gary has custody right now, but his mom is going to watch Leah so he can go out with Amber for her birthday," s source told Breaking Celebrity News prior to the bash.

Still upcoming is Amber's court date for beating Gary.  She's charged with two felonies because it took place in front of their daughter.