Megan Mullally to Guest Star on NBC's UP ALL NIGHT

According to E! Online, stage and screen star Megan Mullally will soon star in an episode of NBC's 'Up ALl Night' as Maya Rudolph's rival Shayna Mund.

Megan made her television debut alongside Elaine Stritch and Ellen Burstyn on "The Ellen Burstyn Show" in 1986. She appeared opposite Stanley Tucci as Walter Winchell's wife in Paul Mazursky's award-winning HBO bio-pic Winchell and opposite Juliet Stevenson in Lifetime's "The Pact." She has guest starred on the hit shows "30 Rock," "The New Adventures Of Old Christine," and "Boston Legal," among others.

She then received an Outer Critics Circle Award nomination for her performance as Rosemary in the Broadway revival of How To Succeed In Business Without Really Trying opposite Matthew Broderick and starred in the hit Broadway musical, Young Frankenstein. Her other Los Angeles theater credits include The Berlin Circle at The Evidence Room Theater, for which she won the 2000 BackStage West Garland Award for Best Lead Actress in a Play and the L.A. Weekly Award for Best Leading Female Performance. She also appeared in Mayhem at The Evidence Room, as well as a variety of plays and musicals in both Chicago and Los Angeles.

On the big screen, Megan starred in the film Everything Put Together directed by Marc Forster - an entry in the 2000 Sundance Film Festival's main competition and also appeared in 1999's Anywhere But Here. Other feature film credits include Stealing Harvard, Speaking Of Sex, and Rebound.

UP ALL NIGHT created by Emily Spivey (NBC's "Parks and Recreation" and "Saturday Night Live") and executive produced by Lorne Michaels (NBC's "Saturday Night Live" and "30 Rock"), is an irreverent look at modern parenthood.

Christina Applegate ("Samantha Who?") stars as Reagan Brinkley: loving wife, successful career woman, life of the party and, most recently, mom. Determined not to compromise her career or cool reputation to the cliches of motherhood, Reagan adjusts to life with a baby and returns to work with the support of her stay-at-home husband, Chris (Will Arnett, "Arrested Development"). As Reagan and Chris figure out their new life, self-doubt, sleep deprivation and the pressure of today's parenting protocols rattle their confidence. What's more, the endless needs of Reagan's boss, ambitious but vulnerable talk-show host Ava (Maya Rudolph, "Saturday Night Live," "Bridesmaids"), threaten to throw Reagan off balance.