The video resurfaced after the couple got engaged over the weekend.
The 21-year-old model was sporting what appeared to be an enormous diamond ring the day after her beau popped the question.
ET can confirm Bieber popped the question to Baldwin on Saturday night while the couple was staying at a resort in the Bahamas.
While the couple only recently rekindled their romance, it turns out the 'Sorry' singer's been sure of his feeling for some time.
While Justin Bieber was down on one knee, his ex was kicking back with friends off the coast of NYC.
The pint-sized singer is defending her fellow pop star.
The pop singer popped the question while on a romantic getaway.
The pair have been inseparable.
A source told ET last week that the two have been 'casually dating' for about a month.
An eyewitness tells ET though the two didn't show any major PDA, they were 'definitely flirty' while grabbing juice at Hu Kitchen.
The lovebirds suffered a breakdown while tooling around the luxury neighborhood on Monday.
Bieber and Baldwin weren't shy about packing on the PDA while out and about in New York City.
The two shared a steamy smooch after eating lunch together in Brooklyn, New York, over the weekend.
The former 'Hills' star ran into Bieber while out in Los Angeles on Thursday night.
