When it comes to birthday parties, Siena Agudong thinks the messier, the better! “The best birthday I ever had was probably my 14th birthday when I went paintballing with a bunch of my friends and family,” Siena dishes to Girls’ World. “It really hurt! But it was super-fun, and we were all so competitive.” In fact, Siena had so much fun on her special day last year that she plans to have another action-packed party when she turns 15 on August 19. “I’ll probably go paintballing with some of my closest friends and family again,” she smiles. “Or do something else superadventurous!” After an intense b-day activity, the No Good Nick star says she wants to dig into her favorite type of cake: “Warm strawberry cake with cream cheese frosting!” Siena exclaims. Mmm, that sounds delicious!