Setting off to delve into what was a busy holiday night in the Big Apple, Selena Gomez was spotted leaving her Manhattan hotel on New Year's Eve (December 31).

First tending to a performance as part of MTV's NYE in NYC 2012 telecast, the 19-year-old singer/actress was met by a large crowd of gathered fans as she toted a handful of belongings out to an awaiting ride en route to the network's studios.

Following her MTV efforts, Selena rushed off to join up with boyfriend Justin Bieber - as the "Baby" hitmaker hosted a private soiree at the Glass House after his performance on "Dick Clark's New Year's Rockin' Eve".

Sounding as if the twosome had quite the fun-filled rendez vous, an insider told E! News, "He [Justin]...danced with Selena, showing off, picking her up and swinging her around like it was Dancing With the Stars."

Bieber also treated partygoers to a rendition of his newly released Jaden Smith collaboration "Happy New Year" before things wound down to a close at around three in the morning.