Despite rumors to the contrary, Leonardo DiCapriodidn't buy girlfriend Blake Lively a new Prius ahead of her 24th birthday. But he apparently did present a special little something to her dad. Us Weekly says the actor, who began filming "The Great Gatsby" this week in Sydney, Australia, gave Papa Lively an "elaborate" comic coloring book. "Blake's father loved it," says a source. And with the parental units evidently on board with the romance, the mag attempts to give the fair-haired honeys a push down the aisle. "Leo loves that she has such a tight-knit family," enthuses another insider. "I bet they get engaged in the next six months." Another snitch gushes that Leo and Blake "are so smitten, it's crazy."