According to the NY Post, she could be. Below is how they are reporting it...
Music insiders are chattering about Beyoncé expecting her second childSpot the supposed baby bump on the right photo. It could just be a lot of food tho :-)
with husband Jay-Z. Multiple sources told us after the Met Gala last
week that the singer, who is currently in the middle of a world tour, is
pregnant. Bey wore a Givenchy gown with a high, belted waist that
carefully camouflaged her midsection, but pictures have emerged on blogs
of what looks like a baby bump from recent tour dates.