Rumer Willis doesn't think it's a big deal her step-father Ashton Kutcher is BFFs with her biological father Bruce Willis . "We all have so much fun together. I’m so lucky," she tells this weekend's Page Six magazine . "My dad and Ashton get along — it’s not weird. There’s no jealousy or drama. "If we weren’t all entirely morally opposed to doing a reality show," she adds, "I guarantee it would be the best-selling reality show ever.” She says Kutcher — who wed Moore in 2005 — "is so cool. He definitely is a father-slash-older brother figure, but at the same time I can still go out with him and have an amazing time." Did you know Ashton's a twin? Play Us' Guess the Twin game . She thanks her mom and dad (and step-dad!) for keeping her so grounded. “Sure, I have my issues, but I’m not in rehab. I’m not in crazy debt. I like the fact that I didn’t just get my GED, but I graduated from high school," Willis, 19, says. "A lot of it has to do with my parents. They have a desire to keep us [kids] grounded and give us a normal upbringing.” ...