Rihanna & Christina Milian almost collaborated on 'SOS.'

Rihanna's producer Evan Rogers claims that Rihanna's monster hit 'SOS' was supposed to be a duet with Rihanna and her then label mate Christina Milan.

The official story was always that 'SOS' was originally meant for Christina, who passed up on the track. Never any mention of a duet. Christina's loss. The cut was one of the biggest smashes from the start of Ri's career, becoming her first song to peak at #1. This was probably the worst decision Christina ever made. And now she religiously models Ri's Savage x Fenty line. Won't work *with* her, but will now work *for* her. Still... I dig the sistahood.

Source: Vulture.