Theeeeyyyy're baaaaaack!

Mr. and Mrs. Bieber are back in LA after ringing in the new year in Hawaii with their Hillsong pastor Carl Lentz and his wife and some other church pals.

Hailey arrived solo at the Montage Beverly Hills where the couple shares a penthouse residence. She was sporting a Chicago Bulls Starter jacket, black skinny jeans and white Converse high-tops, carrying a black Chanel camera bag.

Meanwhile, we spotted Justin headed to the gym to get his 2019 workout on. It was recently revealed that Justin did, in fact, get a face tattoo -- the word "grace" just above his right eyebrow -- but new intel claims it's disappearing ink! Watch and learn, folks ...