Selena Gomez Surfaces on a Boat After News of Justin Bieber's Engagement

Selena Gomez seems to be taking the news her on-again-off-again ex, Justin Bieber, is engaged to Hailey Baldwin quite well. And why not? She's living her best life ... on a boat.

Selena surfaced Sunday in a friend's social media post, where she's seen in a bikini and in open waters near NYC. She's all smiles too ... no signs of distress after the Biebs got on bended knee for another woman, despite so much history with the dude herself.

She hasn't been spotted cozying up with anyone as of late, so it's possible Selena's enjoying some solo personal time post-Bieber ... and post-Weeknd, too. Good on her.

TMZ broke the story ... Justin proposed to Hailey Saturday night during their trip to the Bahamas. His security team made onlookers put away their phones before he popped the question ... and she said yes.

Remember ... Justin and Selena were together at Jeremy Bieber's wedding in Jamaica this past February, where the then-couple couldn't keep their hands off each other.

Guess the marriage bug bit JB harder than it did SG. To each their own, we suppose ... ¯\_(ツ)_/¯