Justin Bieber and Selena Gomez got in more tanning by the pool in Cabo today. Selena wore another bright bikini after lounging with shirtless Justin earlier this week. The couple have had plenty of time to relax during their Mexican vacation, but the trip also included an exciting celebration. Selena was a bridesmaid in her friend Shannon Larossi's wedding yesterday, and while the newlyweds took postceremony pictures, Selena and Justin kissed on the beach. Their fun in the sun will soon come to an end, though, since Justin is heading to the capital for the annual Christmas in Washington show. Justin performed for President Obama during the event in 2009, and this year he'll be featured again, along with Conan O'Brien, who's set to host.