Star alignments with fashion are nothing new, but this month marks the fruition of two sister acts we’ve known about for awhile. But now we finally get to see the results.

Sienna Miller and her sis - Savanah. The new label Twenty8Twelve shows that Sienna knows more than boho. The label, whose name comes from Sienna’s birthday-December 28-will be available exclusively this fall at Neiman Marcus and Bergdorf Goodman. The 80-piece line, entitled "An Anthology of Rebellion," was inspired by the 1920s and Patti Smith.

Penelope Cruz and her sis - Monica. The duo unite for a one off collection with Mango MNG. It’s a working girl’s dream of 50’s and 70’s vintage inspiration. My picks are this black jacket and the baby doll dress. It’s really a shame that this is a limited edition collection. Maybe if we ask nice they’ll make us some more pretty clothes from the pretty sis’s.

   

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