Robert Pattinson and Kristen Stewart partied late into the night in Vancouver on Saturday to celebrate wrapping Breaking Dawn and her 21st birthday! The two were spotted sharing cigarettes outside the bash, and Robert took a turn on Taylor Lautner's motorcycle. Taylor and Lily Collins went out on a date in the Canadian city earlier in the week, and this time she got to meet the whole cast and take a turn on the bike as well as they celebrated finishing filming on the last two Twilight movies. Robert and Kristen also huddled close and shared a quick kiss outside the soiree. Rob had a bit of a James Dean thing going on when he jumped on the bike, and he looked like he was having a great time letting loose with his friends. Edward and Bella's wedding was the one of the final scenes they had to work on and they shot it this week. Robert is juggling his time between finishing up Twilight shooting obligations and promoting Water For Elephants.