'The Leftovers' Star Justin Theroux Pours Water On Fiancee Jennifer Aniston For ALS Ice Bucket Challenge; Aniston Nominates Charlie Downey, Courteney Cox, Chelsea Handler, Howard Stern: WATCH

"Leftovers" actor Justin Theroux helped his fiancée Jennifer Aniston complete the ALS Ice Bucket Challenge after nominating her to participate in the viral activity.

"I'm going to make a huge, ginormous donation and so should all of you," Aniston said and nominated Charlie Downey, Courteney Cox, Chelsea Handler and Howard Stern before Theroux poured ice cold water on her head.  

After the dousing, Aniston laughed hysterically.

"Oh my God, this is the worst! Take it away! Take it away!" Aniston screamed.

Theroux then leaned down and gave Aniston a kiss her on the cheek.

Watch Theroux help Aniston complete the ALS Ice Bucket Challenge here:

A day before this, Theroux completed the ALS Ice Bucket Challenge with the help of his friend Jimmy Kimmel.

Wearing a tight navy T-shirt and jeans, the 43-year-old actor was drenched with ice cold water by an unidentified friend from behind while several others appeared to be looking on.

"I would like to challenge members of the Lab(yrinth) Theater Company in New York, David Lynch and because she's not here to see me do this, Miss Jennifer Aniston," Theroux announced his nominees.

On Aug. 10, Theroux and Aniston reached their second year as an engaged couple. In 2012, Theroux proposed to Aniston on his 41st birthday, US Magazine reported.

Recently, Aniston has already started a pre-wedding diet and workout regimen, Independent has learned.

Meanwhile, Aniston will be featured in the upcoming film "Life Of Crime,' where she plays a wife of a corrupt developer, who committed kidnapping that went terribly wrong and resulted to a series of disasters.

Directed by Daniel Schechter, "Life Of Crime" is based on Elmore Leonard's novel "The Switch." It also stars Mos Def, Tim Robbins, John Hawkes, Isla Fisher, Mark Boone Junior, John Hawkes, Will Forte, Clea Lewis, Charlie Tahan and Kevin Corrigan among others.

"My favorites. Were the ones that stayed closest to the books. Jackie Brown was so thoroughly grounded in reality and real characters," Daniel Schechter told Yahoo! Movies about the challenges of adapting Leonard.