E! News reports, with photographers surrounding Bieber and Gomez as they tried to make their way to their car, Bieber, annoyed, flipped the paparazzi off.
"Had a great bday and at the end of the night we got surrounded by paps,” Bieber wrote on Twitter. He did apologize for how he acted, adding, “I reacted in a way I know better. I’m sorry," he tweeted. "It’s not always easy but I know better than to react in anger."
Later, he tweeted, “life has it's ups and downs but u guys r always there 4 me. I will make my mistakes but I promise 2 continue 2 grow with u and try 2 do rt. So thank u for a great bday and an amazing gift of charity to help others. another year but still the same kid. still grateful.”