Nathan, 20, shared a cute black and white photo of himself and American star Ariana on Instagram, and they looked super excited to be sharing their first holiday together.
In the close-up snap, Ariana looks as if she is beaming with joy, as her wavy brunette locks cover her mouth, while Nathan is also captured smiling.
Nathan, who confirmed his relationship with the 20-year-old singer in September, simply captioned the photo with a heart symbol.
Ariana, who is most famous for her role as Cat Valentine in Nickelodeon's Victorious, also attended the 87th Macy's Thanksgiving Day Parade in New York City.
The starlet performed and got crowds into the festive spirit by singing her cover of Wham's classic hit, 'Last Christmas', where she was joined by a larger-than-life Dora the Explorer!
Taking to Twitter, Nathan said: "Celebrated my first proper Thanksgiving today. Was a load of fun! Hope everyone else celebrating had fun too."
Meanwhile, Ariana, who duetted with Nathan on 'Almost is Never Enough' in August, simply said: "Happy Thanksgiving my loves... Wishing you a beautiful holiday with your families and loved ones. I am so thankful for you."
Watch the music video for Nathan and Ariana's duet 'Almost is Never Enough' below: