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Now you see her, now you don't!

Nicole Richie and Joel Madden went to dinner at Nobu in Malibu last night, and even though the reformed party girl flashed us a quick smile (and a peek at her bra!) on the way out, she ducked for cover as Joel drove her and a few friends home.

In other news, it's being reported that Nicole and Joel are trying for their third child together, and In Touch claims that she's even "gained a few pounds in the hope she will be expecting soon." Hmm, she doesn't look any bigger than usual these pics...

The mag also reports that Nicole wanted to wait and see if Fashion Star took off, but "that didn't happen ... so now she is back on board with the family plan." The source added, "She told me that she got pregnant easily the first two times, so it shouldn't be that hard. But they are definitely trying."