From the opening of SPiN Standard in Downtown L.A. to last night's Hollywood premiere of This Is 40, there have been lots of outfits to scope out on party guests in L.A. over the last couple of days. Most were not so good, but some were great. Let's discuss our favorite looks in these picks for Tuesday and Wednesday's Best Dressed Guests.

The Guest List

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Susan Sarandon• Paul Rudd• Aubrey Plaza• Megan Fox• Roland Mouret• Leslie Mann• Maude Apatow• SPiN Standard• SPiN Standard Grand Opening Party• This Is 40 Premiere• SPiN Los Angeles opening• SPiN LA• Lara Lee Bell• This Is 40• Christian Louboutin Pigalle• Megan Fox in Roland Mouret• Megan Fox This Is 40 premiere dress• Leslie Mann This is 40 premiere dress• Leslie Mann Vionnet dress• Maude Apatow This is 40 premiere dress