Joe Jonas might not be the only one who had shared Saturday night, Nov. 4, with an important person. His brother, Nick, was seen acting sweet with Georgia Fowler at the engagement party of Joe and fiancée "Game of Thrones" actress Sophie Turner.

Nick and Fowler both attended the celebration for Joe and Turner at Mamo restaurant in New York City, though they arrived at the venue separately. According to the US Weekly, the two were "casually dating" and were seen getting cozy at the party before deciding to leave the party together.

An E! News source also confirmed that the "Jealous" singer and Fowler were dating but that it was not exclusive. "She thinks he is very sweet and sexy. Every time they hang out he has been a complete gentleman," the insider said. Aside from this, the source revealed that Fowler had been "comfortable" with the Jonas family during the get-together but added that the Victoria's Secret model was focusing on her career.

The rumors have long been sparked by previous sightings of the two, which had fans quickly concluding that there was something between the singer and the model. One fan had even taken the time to link actions of Fowler and Nick, noting that Fowler was once singing along to a song of Nick in her Instagram story and that Nick uploaded a photo of the model to the same social media site.

On her social media account, Fowler uploaded photos with Turner during the party, which was attended mostly by celebrities. Also present in the party were Kevin Jonas and wife Danielle, model Ashley Graham and husband Justin Ervin, and "Fault in Our Stars" actor Ansel Elgort. DNCE bandmates of Joe, Cole Whittle and JinJoo Lee, were also spotted at the celebration.

Nick had dated "Wrecking Ball" singer Miley Cyrus and "The Other Woman" actress Olivia Culpo, while Georgia was rumored to have dated singer Harry Styles and "Titanic" star Leonardo DiCaprio.