Forget who, if anyone, cheated on whom for a moment.
Forget the tension that clearly exists between Selena Gomez and Justin Bieber, following their fight in Mexico over New Year's and subsequent break-up.
Forget why Selena said she could relate to Justin Timberlake's "Cry Me a River" when she covered it over the weekend and let's just focus on the vocal talents of these singers, okay?
Because Bieber sang this same infidelity anthem late last year, we can compare the tracks above and ask: Who did it better?