Superstar Rihanna is the subject of pregnancy rumors after she canceled another concert Monday in Houston -- the fourth show the "Diamonds" singer has dumped on her world tour, which kicked off March 8.
Sources tell TMZ RiRi is suffering from a throat infection, but the lack of communication from her camp has spurred talk that she may have a bump in the oven.
She did tell Elle UK magazine's April issue that a child is part of her future plans. "I will probably have a kid… and I'm praying I can go on vacation for a good month."
Rihanna reunited with ex-boyfriend Chris Brown in January, but they reportedly split again in April to focus on their careers and business ventures.