After a 10-month romance, Zac Efron, 33 and his Byron Bay girlfriend Vanessa Valladares, 25, have called it a day. Zac’s celebrity pal, radio host Kyle Sandilands, confirmed the news on his radio show last week. “They’ve gone their separate ways,” Kyle, 49, revealed, admitting the actor’s busy schedule put an end to the romance. “They spent a lot of time with each other when he wasn’t working, lunching and living in the mansions on the beach, it’s a fabulous life. And then work comes back and kicks you straight back into reality, so it’s a shame.”…