The 'Beautiful' hitmaker has been confined to a sling since July after taking a severe fall and dislocating her shoulder on the set of a music video, reported E! online.
"I feel like I have suffered the toughest experience of my life about several things; one was having twins and anybody who's ever had multiples will know it is one of the most difficult experiences ever but the reward is just beyond," the 43-year-old singer said.