PREVIEW: Up All Night “Letting Go” (PHOTOS)

REAGAN AND CHRIS FACE THE CHANGES IN THEIR LIVES -- STEVIE NICKS AND CHRIS DIAMANTOPOULOS GUEST STAR -- Reagan (Christina Applegate) and Ava’s (Maya Rudolph) changing responsibilities at home, a newly walking Amy and Julian’s (guest star Chris Diamantopoulos) most recent gift to Ava, a dog, threaten to interfere with

PREVIEW: Up All Night “Daddy Daughter Time” (PHOTOS)

REAGAN AND AVA HAVE A DIFFICULT TIME WITH THE MEN IN THEIR LIVES – HENRY WINKLER AND SHARON OSBOURNE GUEST STAR –When Chris gets a segment on the Ava show, Reagan starts to realize how much she needs her own space at work. Meanwhile, Ava’s dad (guest star Henry Winkler)

PREVIEW: Up All Night “Baby Fever” (PHOTOS)

REAGAN IS IN FOR A SURPRISE WHEN CHRIS CATCHES BABY FEVER -- STEVEN PASQUALE AND EVE BEST GUEST STAR – Chris pulls out all the stops to convince Reagan to have another baby. Meanwhile, Ava’s decision to join a mentorship program, started by Yvonne Encanto (guest star Eve Best, “Nurse

PREVIEW: Up All Night “Couple Friends” (PHOTOS)

FRIENDSHIP'S IN THE AIR, WHEN REAGAN AND CHRIS MEET A NEW NEIGHBORHOOD COUPLE -- STEVEN PASQUALE, BEN FALCONE AND NAT FAXON GUEST STAR-Reagan (Christina Applegate) and Chris (Will Arnett) try a little too hard to befriend a fun couple, Justin (guest star Ben Falcone, "Bridesmaids") and Lawrence (guest star Nat

PREVIEW: Up All Night “New Boss” (PHOTOS)

THE AVA SHOW GETS A NEW BOSS — EVE BEST, STEVEN PASQUALE AND WILL FORTE GUEST STAR -- On the cusp of the fifth anniversary of "Ava," Reagan and Ava’s idol, Yvonne Encanto (guest star Eve Best, “Nurse Jackie”), acquires the show. This acquisition brings more than they were expecting

PREVIEW: Up All Night “First Birthday” (PHOTOS)

A moment of weakness with his uncomfortably enthusiastic neighbors leads Chris to agree to host a joint first birthday party for Amy, and Reagan to accuse him of being a pushover. Ava takes it upon herself to take the birthday party to the next level, while Nancy (guest star Molly