They were both gussied up as they left Gulfstream restaurant in Century City, as Pia told us she -- like everyone else -- was surprised she got the "A.I." heave-ho.
Until Pia got the boot, they were both rehearsing and shooting their shows next to each other at CBS Television City in L.A.
It's unclear if Mark -- a known chick magnet -- or Pia made the first move...
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