Continuing her post-rehab comeback, Lindsay Lohan will appear on the upcoming season of comedian Danny McBride's HBO series "Eastbound & Down."

HBO Thursday confirmed to Newsday that the actress will guest-star on the fourth and final season of the sitcom about a drug-fueled former big-league pitcher, Kenny Powers, and his own comeback machinations.

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TMZ.com, which first reported the news, said Lohan, 27, would play the adult version of baby Toby, Powers' daughter with on-and-off girlfriend April (Katy Mixon), on the series finale. She is currently filming the part in North Carolina, the site said.

Lohan, who recently guest-hosted E!'s "Chelsea Lately" and whose interview with Oprah Winfrey airs on OWN Sunday, posted an image of herself on Instagram holding a cellphone with a cartoon caricature of an unspecified man, captioning her photo, "Back at work! So grateful today! :)"

"Eastbound & Down" began shooting its finale eight-episode season on June 7, said HBO. The final season is scheduled to premiere Sept. 29.

Lohan, who completed her most recent court-ordered stay in rehab in July, will star in an eight-part series on OWN about her much-publicized struggles with substance abuse and the legal system, as well as her career and her plans. Documentary filmmaker Amy Rice (2009's "By the People: The Election of Barack Obama") is directing. The show is scheduled to air next year.

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On Aug. 2, her most recent movie, the independently produced erotic thriller "The Canyons," opened theatrically.