Do you remember where you were when you heard about epic beauty collaborations like MAC x Rihanna or Beyonce x NCLA? These were major moments in beauty that shouldn't have be missed. Well 2015 has already delivered some pretty out-of-this-world beauty mash-ups. If you're like us and need to be in the know of beauty's biggest and baddest collabs, we've got a list just for you. Don't miss out on these once and a lifetime products!Do you remember where you were when you heard about epic beauty collaborations like MAC x Rihanna or Beyonce x NCLA? These were major moments in beauty that shouldn't have be missed. Well 2015 has already delivered some pretty out-of-this-world beauty mash-ups. If you're like us and need to be in the know of beauty's biggest and baddest collabs, we've got a list just for you. Don't miss out on these once and a lifetime products!