Bollywood's charm king Ranbir Kapoor turns a year older today. The actor who has been missing from the screens for more than 3 years turned 39 today. On the occasion of Ranbir's 39th birthday, her sibling and fashion designer Riddhima Kapoor Sahni took to her Instagram handle and penned a warm birthday note.Taking to Instagram, Riddhima shared a cute group picture that had her with Ranbir, his ladylove Alia Bhatt, mother Neetu Kapoor and daughter Samara. Sharing it Riddhima called the ace actor 'Rockstar' and wrote, "To my rockstar bro -Heres wishing you a very happy bday !!!!! We love you so much #youngerbutwiser".