Lindsay Lohan announced via Instagram she is back to work following the completion of her court-ordered, 90-day stint in a Malibu rehab.

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"#back@work! So grateful today! :)" she wrote Wednesday, alongside a photo of herself.

Although she offered no details about what she is working on this week, HBO told E! News Lohan has been booked to guest-star on the upcoming fourth and final season of its Danny McBride-starring sitcom "Eastbound & Down."

The eight-episode season is to kick off Sept. 29.