do you mean body piercings? If so, as many as you can sit for. Some people have gotten hundreds of piercings in one day.
one on his left ear
three one on her nose,and one on each ear
12 piercings
she has 2 peircings one one the top and one on the bottom
Beyonce have two one on her left and right ear
He doesn't have any piercings but he does have tattos
He does have one tattoo on his left arm that says "Ma Kin". But also, he actually has several piercings in each ear.
He did have a pircing on his lip and one on his ear in 2005 i think
Zendaya has the regular 2 piercings.
Dont waste your money on the piercing gun thingies, go see a professional piercer and get the piercings laid out the way you want them to look. those piercing gun kits are generally made of cheap low grade metal studs and the layer effect cant be done with them the way the gun is designed. Maximum piercings is 3 in one day, any more and the body is taxed too much. Do one ear one day then the other a couple of days later. Check with you local body piercing studio, they will often work out package deals for multiple piercings.
Theres so many places to get piercings that there really isn't a definite answer. Also depends on if you mean permanent piercings or play piercings.