Doctors order Piven to 'immediately' cancel Broadway run

A mystery illness has prompted doctors to order actor Jeremy Piven to "immediately" cancel all upcoming performances in ongoing Broadway play 'Speed-the-Plow'.

The 'Entourage' star made his Broadway debut in the David Mamet play on October 23 and was scheduled to perform throughout the show's run, until its close on February 22.

Piven missed his performance on Wednesday evening and has pulled out of two shows on Thursday.

A spokesperson for Piven tells TMZ.com: "Jeremy has not been feeling well and the doctors have advised him that he should end his run in 'STP' immediately."