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A Prada-clad Sirena becomes our second Stud of the day...

In a burgundy-bordered boxy vest from Miuccia Prada's Spring/Summer 2013 collection, Sirena has stepped in front of Nick Knight's lens. In a look completed by skater shorts from Pharrell Williams' Billionaire Boys Club and chrome nails by nail artist Mike Pocock, Sirena has brought with her a clean and graphic line to the Studs story.

Watch Studs live here now