With a new album of holiday cheer, We Wish You the Merriest, under their belts, Liz Gillies and Seth MacFarlane have become one of the most popular recording duos of the season. Yet their sonic story goes back a decade.

Gillies, who starred as Fallon Carrington on "Dynasty," met the "Family Guy" at a karaoke bar and noticed they were singing in similar styles.  She was singing her go-to: Julie London’s "Cry Me a River" and recalls MacFarlane singing Frank Sinatra.

"We immediately realized that we both shared a deep love and affinity for this music," Gilles told GRAMMY.com by phone about their mutual admiration for jazz and crooning styles of the 1940s and 50s.

She started joining his Los Angeles concerts at the Catalina Jazz Club in 2014/2015 and then went with him on tour. "When you find somebody that you share that kind of common ground with and you have great chemistry with –  it sort of feels like you'd be doing a disservice not to explore it," she says.

They released a joint un-official album, Songs From Home, in spring 2021 and fans quickly clambered for a Christmas album. In November, Gillies and MacFarlane finally delivered.

Their 13-track We Wish You the Merriest features many classics — from "Frosty the Snowman" to "That Holiday Feeling" — sung in the styles of Bing Crosby and Rosemary Clooney. "This is as close to a classic feeling, warm, fuzzy, nostalgic Christmas album you’re gonna get these days," Gilles says.

"Seth is sort of like this youthful energy, as much as he loves these older songs. I truly present myself like a 50 to 60 year old woman from 1950," says 30-year-old Gillies. "So onstage it really works. We love a lot of the same movies. A lot of the way we banter and our jokes are very similar." 

Singing has long been a part of Gillies' repertoire, beginning with her Broadway debut at 15 years old in "13: The Musical" alongside Ariana Grande. They both went on to star and sing on Nickelodeon’s "Victorious" and have sustained a friendship ever since. Gillies even appeared in Grande’s "Thank U, Next" music video.   

They recently went viral for their Halloween costume reveal. "We already know what we’re doing next year," Gillies teased. "We have this all mapped out. It's been a fun, new tradition that we started and it's just a blast. It lets us be wacky, free and creative."  

Asked whether they’d ever perform together again – Gillies said it’s all about timing. "If there’s an opportunity that makes sense, we would love to be on stage together, create something together. We're always talking about it," she said.  

Right now, the focus has been her partnership with MacFarlane.  

Recording a Christmas album was especially meaningful to Gillies, who  remembers listening to these classics during her childhood  in New Jersey. The holidays were "the most important time of year" for Gilles' music-loving family. "I just remember being completely enveloped in Christmas music," she recalls.

"[Holiday music] was very much a part of my childhood and a part of my upbringing in my education, musically," Gillies notes. "The fact that I'm even on a Christmas record — let alone with this amazing orchestra and with these arrangements — is pretty surreal for me. 

"They feel so familiar to me," she continues. "That's why I was happy to do a more classic album because I don't think I would succeed doing a pop Christmas album. I wouldn't know where to start." 

In honor of We Wish You the Merriest, Gillies shares some of her favorite holiday songs and why.  

"The Christmas Waltz" - Frank Sinatra 

"The Christmas Waltz" is one my grandma always would sing. She sang it the other night as well — I just had my family Christmas party this past weekend. We have so many traditions and so many beautiful memories and things that we do at parties during the holidays. 

I know it's Seth’s favorite Christmas song, I believe, and it's one of mine as well. Several members of my family play the piano and after dinner and before dessert, we always went over to the piano. [This happened] since I was a kid, and generations before I existed sang Christmas carols. 

"Winter Wonderland" - James Taylor 

I remember my dad having this huge stack of CDs and the first one always that went in was actually James Taylor's Christmas album, believe it or not. The first song on that album is "Winter Wonderland." Once that started, I would get a very Christmassy feeling in my house and I would know that it was Christmas time. 

"The Christmas Song" - Nat King Cole

To me, the quintessential Christmas song is "The Christmas Song" by Nat King Cole. That is the song I think Nat has, in my opinion, one of the most beautiful voices of all time. That song, no matter where I am when I hear it, I stop.   

"Sleigh Ride'' - Ella Fitzgerald

That's another one that I really love. It's so effortless, jazzy and fun. I tried to emulate little parts of each of these [songs] in our record although our arrangements are different.  

"Have Yourself a Merry Little Christmas" - Frank Sinatra  

Judy [Garland’s version] is very beautiful and very sad, so I don't listen to it as much. Frank’s is almost haunting. I believe it starts acapella. It’s so beautiful and his voice sounds so rich and velvety. I love that version of that song.  

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