Christina Aguilera & Matt Rutler: New Year's Eve!

Christina Aguilera and her boyfriend, Matt Rutler, step out together on New Year’s Eve (December 31) in New York City.

The entertainer, who celebrated her 31st birthday earlier in the month, recently belted out her own rendition of the Christmas classic “Have Yourself A Merry Little Christmas”.

PHOTOS: Check out the latest pics of Christina Aguilera

Christina celebrated her birthday with her Voice co-stars Adam Levine and Blake Shelton with a fun bowling party in Los Angeles. The singer was joined by 50 friends and family members for the bash, the San Francisco Chronicle reports.