Justin Bieber is reunited with his muse, ex-girlfriend Selena Gomez. After last week's reunion with his lady-love, Justin Bieber has taken to Instagram to tell the world that after all his legal run-ins, being with Selena Gomez means "Life is Worth Living Again."

While the start of 2014 was shaky at best for the "All that Matters," Hollywood Life reports that Justin Bieber, 20, has been getting pretty busy with on-again, off-again girlfriend Selena Gomez, 21. Could the new song he posted Saturday be inspired by Selena?

Unlike his series of break up and heartbroken tunes like "Nothing Like Us," it's telling how the star feels given that the new ballad puts forward a happier and hopeful Bieber.

The heartfelt song hints at the recent reunion he's had with his one and only childhood sweetheart.

Justin gave fans a treat by sharing a bit of the upcoming tune with fans. Listen below to hear the snippet of the song:

Selena Gomez is equally Happy?

Don't worry fans, according to an insider who spoke to Hollywood Life; it's not only Bieber that's head over heels in love. Apparently, the Slow Down singer "is in love with Justin and doesn't care what anybody thinks."

Recently, Selena has cut off her best friend Taylor Swift who has been well-known to disapprove of Gomez' relationship with the "Heartbreaker" singer and was upset when the "Come and Get it" singer Selena took Justin back. A source claims that the friends are not on speaking terms.

IB Times reports that Selena tried to keep her reunion with Justin a secret because she knew friends and family would be disappointed, claims a source.

"Selena kept this from everyone because she knows how much her friends and family disapprove, they think Justin's bad news, and would have tried to put a stop to this," continued the source.