Pasquale will play the central role of Tom beginning Jan. 5. Piven, who won rave reviews, will leave Jan. 4 for "earlier than anticipated production on season 2 of HBO's 'Entourage.'" Pasquale currently stars on FX's series "Rescue Me."

Capshaw (who is Kate Capshaw's daughter) will play the Russell role of Tom's vengeful ex-girlfriend Jeannie. She starts on Jan. 17; Russell leaves Jan. 15. Capshaw was a serie regular on "The Practice."

Andrew McCarthy and Ashlie Atkinson remain with the cast.

The MCC Theater production of Fat Pig, the latest drama by Neil LaBute, which opened Dec. 15 at the Lucille Lortel Theatre to largely positive notices, recently extended to Feb. 5. Previews began Nov. 23.

Piven plays a youngish big city businessman who unexpectedly finds himself attracted to an outgoing, overweight librarian. The relationship furnishes him with feelings of contentment and growing maturity, but causes him unending and increasing anxiety at work, where the prying and judgemental minds of his co-workers prove merciless in their assessment of his new mate. Relative newcomer Atkinson is Helen, the object of Piven's affections. McCarthy is Carter, a rotter of an office pal.

LaBute's other plays include bash, The Shape of Things and The Mercy Seat.

For more information on MCC, visit www.mcctheater.com.