Is Avril Lavigne carrying hubby Deryck Whibley's child "Under Her Skin?"

The couple was spotted spending $500 at a posh kids' clothing store, picking up a cheetah diaper bag, baby AC/DC tees, a camo pacifier holder, and more, TMZ reports. Then, Avril went to another children's outfitter for more! "She definitely looks like she has a bump," a spywitness says. Avril's reps are mum on the subject, but we're looking forward to a lil' skater boi or grrrl!