Hayden Panettiere celebrated her 19th birthday over the weekend by apparently wearing a bikini and a party hat. Cool. I’ll be the first to admit this looks nothing like I envisioned it. I mean, where’s the parade? The midget rodeo?! And why is the pool filled with water instead of Jell-O? No, no, NO! This is all wrong! Man, I got all dressed up like Batman for nothing…