This is so sad.
Now we know why he's won the hearts of so many Hollywood beauties!
Who can resist the powers of a seksi man with a guitar and killer voice??!
The Mortal Instruments hottie performed his original song Waiting at Gibson Guitars in London and we're definitely wishing we were the girl he was waiting for in the dark!!!
However, our deductive reasoning makes us believe this adorbzies tune HAS to be about his former lover, Lily Collins, considering he sings about being 23 — the age he was when they were dating last year.
Is this hope grand gesture to win his gorge co-star back??!
[Image via YouTube.]