If i spank my girlfriend will my mom find out?

My gf has prime buttocks, like sooo fine.but seriously you guys, if my mom find out that my baby doll even HAS A BUTT she will FLIP OUT!!! i want to slap those puppies so good.. i even have a paddle aand everythingg...but do you think my mom will hear? please you guys, this is really important! MY MOM WILL KILL ME!!! but i love my gf and her butt...