Justin Bieber's new love ballad is about Selena Gomez.

The 20-year-old singer posted a teaser for the track "Life Is Worth Living Again" on his Instagram account on March 15 and it is reportedly one of many new songs the "Boyfriend" hitmaker has written about his 21-year-old on/off girlfriend.

"Yes, 'Live Is Worth Living Again' was all for Selena and that's not the only song he's written for her. He's written a bunch of stuff for her, she's his biggest inspiration," a source said.

Justin, who has been dating Selena on/off since 2010, also dedicated a song to the brunette beauty during a surprise performance in Texas earlier this month. He turned up at the Banger's Sausage House and Beer Garden in Austin for the South by Southwest festival and sang his hit "As Long As You Love Me" for his "baby," who was standing in the wings. After his romantic gesture, the pair reportedly hung out together for an hour after everyone left the venue.