If you want to have a spa party sleepover and you're in between the ages of 11-12 then this is definitely the kind of birthday you will want to have! First, start off with the invitations. They must be accurate, creative, and cute all at the same time. You can make a card on the computer, hand make one, or get some from the store. Make sure that the invitations have all the important info like, time, where, when, etc. Then it comes to the fun part. Make sure the invitation has nail polish, pillows, lip gloss, and a bunch of other girl stuff decorated on it. That will definitely catch their eye. Basically, the whole invitation is up to you, there's no specific way to do it! Next, decide how many girls you are going to invite. Whether it's 13 girls or 5 you will have a blast either way. But I suggest you keep 13 in mind as the maximum. Then, get ready to make your party the best ever! When all the guests arrive lead them to the spa area and give them a little cute party favor bag with their name on it. At each station they will get a special treatment and a party favor. The stations you should have should be nails,(they can decide if they want a manicure or a pedicure ) massage, facial, hair, and a photo shoot. Then for the girls who aren't at a station give them little things to do while  they wait, games, movies, snacks, etc. Make sure that you have an adult at each station. At each station make sure you have all the right supplies and party favors. At the nail station you will need a bucket to soak their hands or feet in, nail polish, nail polish remover and cotton balls, the basic nail tools, ( nail filers, cuticle pushers, etc. ) foot scrub, hand lotion, foot lotion, callus scrubber, nail clippers, and you can keep going forever but those are the basic needs. Then after the  girl gets her nails done you will give her a few party favors from the station to put in her bag. For the nail station party favors you could give a little mini bottle of nail polish, a cute nail filer with designs on it, and toe separators. Make sure you separate the party favors from the supplies. At the next station, massage, you have two choices. You can buy a non electric or electric massager or you can do the old fashioned way. The good old hands. Any way is great. Also, make sure the massage station is in a comfortable place with lots of pillows. The party favor for this station could be tropical lip gloss and shower gel. The next station is facial. Get any facial mask that's low on the fragrance because you don't want anyone's skin getting irritated at the party. Make sure you have a fresh bowl of cucumbers handy too. The party favor at the station is an elastic headband to hold their hair back. The next station is hair, make sure you have an adult there that is good at hair and give them choices for styles. At the hair station give the girls different style choices and have lots of hair glitter. The party favor at this station is hair scrunchies. The last stations should be the photo shoot because they're all dolled up and nice. Have them strike a glamour girl pose and then send it to them in the thank you note. At the photo shoot the party favor should be a fancy lollypop, like the kinds you get at real spas, not Dum Dums or Hubba Bubba. Then when everyone is done set up a restaurant. Give them a menu and act very professional. Serve hamburgers, hot dogs, salads, fruit kabobs, and Shirley Temples. Then have lots of games afterwards. Then watch some  movies and go to bed, make sure all night there is a snack bar open for everyone. In the morning make a buffet of bacon, fruit, pancakes, cereal, fresh squeezed orange juice, and lots of other stuff. When everyone leaves be sure to wish them goodbye and thank you! For the thank you notes remember to send the photo shoot picture with it!! Have a great party!