Mandy Moore is a huge star that we get to see on a multitude of entertainment platforms each and every day ... which is why we were stoked when she was out with a celeb we don't see too often, Ronnie the Limo Driver!

The security/driver for Howard Stern was walking the "This Is Us" star out of the SiriusXM building Wednesday after her appearance on Stern.

During her interview, Moore talked revealed how she first landed the role of Rebecca Pearson, and the instant connection she had with Milo Ventimiglia.