The Brinkley's are about to welcome another new addition to their household on this week's episode of Up All Night
. Dean Winters
(30 Rock, Rescue Me
) guest stars as Chris' (Will Arnett
) older brother, and it doesn't take long for their competitive edge to come out, much to the dismay of Reagan (Christina Applegate
), who is determined to get baby Amy accepted to a prestigious preschool. Check out this exclusive clip and catch this week's ...