Bollywood playback singer Harshdeep Kaur, best known for crooning Katiya Karoon from Ranbir Kapoor’s Rockstar, has married her best friend Mankeet Singh.The couple got married in a Gurudwara. The 28-year-old singer took to Twitter to share the news with her fans. “Got married to my best friend Mankeet Singh yesterday... Need your blessings (sic),” she tweeted.