Credit: Art Streiber

When it comes to what looks good on you, often your sister knows best. This is certainly true for our November cover girl, Rachel McAdams, whose younger sister, Kayleen (pictured left), is often her makeup artist! Pick up a copy of the November issue on newsstands now and flip to page 292 to learn more. Plus, click through the gallery below to find out how Kayleen helps Rachel nail a wide spectrum of beauty hits, from cat eyes to bangs to pink highlights!