Show stars Mandy Moore</a> and Milo Ventimiglia</a> are bickering on the set of This is Us and their frosty vibes are throwing the cast and crew into a panic, RadarOnline.com is reporting. “This has happened with Milo on every hit show he’s ever been on,” snitches the source of Ventimiglia, who is notorious for keeping his personal life private.<br /><br />“From Gilmore Girls to Heroes — the show gets successful, then Milo gets self conscious, and he starts withdrawing from the camaraderie of the crew, the producers and his fellow actors on a show!” The introverted star is said to get “melancholy and not cheerful,” which sources claims take a toll on his co-star Moore.<br /><br />“Mandy loves the job but the roller-coaster with Milo can be a little too much.”<br /><br />“He walks around with his earbuds in all day or with his head buried in a book. That’s fine for a guest star but Milo is the leading man, the first guy cast for the show, and at this point he has more experience than a lot of the people on the set.” And for Moore — she may just be reaching her breaking point.<br /><br />“Between their emotional scenes on camera and the unpredictability of his disposition when they aren’t shooting,” — it weighs heavily on the actress.<br /><br />
