After finishing rehab just two weeks ago, Lindsay Lohan is already back to work.

A rep for HBO confirms to ABC News that the "Mean Girls" star will appear in an upcoming episode of "Eastbound and Down."

Read: Lindsay Lohan Finishes Rehab, Ready to Work

In fact, Lohan, 27, has already taped an episode. The upcoming season for the R-rated comedy is the fourth and final for the show, starring Danny McBride and set to return Sept. 29.

Just two days ago, Lohan posted a picture of herself on Instagram with the caption, "#back@work! So grateful today! :)"

Watch: Oprah Asks Lindsay Lohan: 'Are You An Addict?'

Back to work is right! In addition to the HBO show, she guest-hosted "Chelsea Lately" earlier in the month and her interview with Oprah Winfrey will air Aug. 18 on OWN.

Lohan checked out of her court-ordered rehab late last month after spending 90 days in treatment.