The 'Office Christmas Party' star opened up to ET about her surprise appearance on 'Saturday Night Live' over the weekend.
Jennifer Aniston stopped by Saturday Night Live over the weekend to jokingly confront Vanessa Bayer about her impression of Rachel from Friends. However, despite any on-screen animosity, the 47-year-old actress tells ET's Denny Directo that the experience was "so much fun."
The Friends actress -- who portrayed Rachel Green on the beloved sitcom -- joined her Office Christmas Party co-star, Jason Bateman, at a junket in promotion of their upcoming holiday comedy on Sunday, and Aniston had nothing but love and praise for Bayer.
"She's the sweetest," she said of the longtime SNL cast member, who also stars in Office Christmas Party. "This is something she's been doing since, you know, she grew up on Friends."
"Ugh, it's so sad when you say that!" Aniston added with a laugh. "But yeah, this was something she's been doing since her stand-up days. We had fun!"
ET also spoke with Bayer, who said it was "a dream" to get to do her impression of Aniston's Friends character with the actress herself.
"She had been very kind about the impression when we were shooting this movie," the 35-year-old comedian recounted. "She had seen me do it, but I had never done it in front of her until yesterday and she was a dream about it and she was just the best."
Bayer's SNL and Office Christmas Party co-star, Kate McKinnon, praised Bayer's "nuanced" interpretation of Rachel Green as "the best impression I've seen."
"It sounds exactly like her but it's also just a funny character and take in its own right," McKinnon shared. "It's incredible."
Aside from her surprise appearance on SNL, Aniston also opened up about her holiday plans with husband Justin Theroux.
"He is the life of the party," she gushed. "People are very bummed when he's not there, which makes me feel great."
This year marks their second Christmas as a married couple, and the actress said she is excited to spend the holiday together, after Theroux, 45, surprised her by coming home for the couple’s annual Thanksgiving dinner.
"He's been gone for so much of the year, it'll be nice to actually [be together]," she said. "He came back for Thanksgiving, so we're excited just to have another holiday."
Aniston, Bateman, Bayer and McKinnon star -- alongside Olivia Munn, T.J. Miller, Courtney B. Vance, Jillian Bell, Rob Corddry and Randall Park -- in Office Christmas Party, which hits theaters Dec. 9.
WATCH: Jennifer Aniston, Jason Bateman, Olivia Munn and More Tease 'Office Christmas Party' Antics
Additional reporting by Randi Iaboni.