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Let the guessing game continue!

Heidi Klum arrived at Radio City Music Hall today in N.Y.C. sporting an all black ensemble that made it difficult to tell whether or not that baby bump we thought we saw the other day was the real deal!

The supermodel looks super slim but her chest does appear to have grown slightly, which makes us wonder whether she's expecting a baby with her bodyguard boyfriend of a year Martin Kristen?

Things have been getting more serious with her beau, and having a child would be the next logical step in the relationship.

We will have to wait and see!