Katie Holmes KHolmesBump0805_04_X17.jpg Katie Holmes' mysterious belly bump sure set us off wondering whether she might have another bun in the oven - especially now that we've seen it in motion!

Here's our video of Katie heading into her acting classes in New York yesterday afternoon. What do you think - could that be a baby bump?

We sure hope so - who wouldn't want to see Tom and Katie fill their huge new house with kids?