"Sophie and Joe met through mutual friends," a source tells ET. "They have been dating for a couple of months. They spent Thanksgiving together in Mammoth Lake. They are really into each other and having a great time."
Related: Joe Jonas through the years
LOS ANGELES, CA - JULY 08: Singer Joe Jonas of DNCE performs at Staples Center on July 8, 2016 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)
AUBURN HILLS, MI - JUNE 24: Joe Jonas of DNCE performs during the Revival Tour at The Palace of Auburn Hills on June 25, 2016 in Auburn Hills, Michigan. (Photo by Scott Legato/Getty Images)
MIAMI, FL - JUNE 11: (L-R) Jack Lawless, Joe Jonas, Cole Whittle and Jin Joo Lee participates in DNCE Hits 97.3 Live Session on June 11, 2016 in Miami, Florida. (Photo by Thaddaeus McAdams/WireImage)
NEWARK, NJ - JUNE 02: Singer Joe Jonas and guitarist JinJoo Lee of the band DNCE performs during Selena Gomez in concert at The Prudential Center on June 2, 2016 in Newark, New Jersey. (Photo by Brian Killian/Getty Images)
NEW YORK, NY - JUNE 02: Joe Jonas of the band DNCE performs live on SiriusXM Hits 1's The Morning Mash Up at SiriusXM Studios on June 2, 2016 in New York City. (Photo by Matthew Eisman/Getty Images)
NEW YORK, NY - JUNE 01: (L-R) Musicians Jack Lawless, JinJoo Lee, Joe Jonas and Cole Whittle of band DNCE visit Music Choice on June 1, 2016 in New York City. (Photo by Monica Schipper/Getty Images)
LAS VEGAS, NV - MAY 22: (L-R) Musicians Jack Lawless, JinJoo Lee, Joe Jonas, and Cole Whittle of DNCE attend the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by Lester Cohen/BBMA2016/Getty Images for dcp)
CARSON, CA - MAY 14: Singer Joe Jonas of DNCE and actress/singer Hailee Steinfeld perform at 102.7 KIIS FM's Wango Tango 2016 at StubHub Center on May 14, 2016 in Carson, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
CARSON, CA - MAY 14: Singer-songwriter/musician Joe Jonas attends the 102.7 KIIS FM's Wango Tango 2016 at the StubHub Center on May 14, 2016 in Carson, California.(Photo by Jeffrey Mayer/WireImage)
Discover More Like This
BACK TO SLIDE
Following the release of photos showing the pair getting cozy at a Kings of Leon concert in Rotterdam, Netherlands, on Nov. 5, the two appeared even closer at a friend's wedding in Malibu, California, on Nov. 26.
The 27-year-old singer and the 20-year-old actress were adorably goofy while posing for group pics in an old-school photo booth, along with several others. The new couple beamed as they huddled together, one row behind Joe's younger brother, Nick.