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Stars come out for White House Correspondents' Association dinner

Saul Loeb / AFP - Getty Images

US President Barack Obama high-fives television host Jimmy Kimmel, right, alongside Caren Bohan, center, of Reuters, President of the White House Correspondents Association during the White House Correspondents Association Dinner in Washington, D.C., April 28. The annual event, which brings together President Barack Obama, Hollywood celebrities, news media personalities and Washington correspondents, featured comedian Jimmy Kimmel as the host.

The black-tie dinner, informally billed as the "nerd prom," is the biggest social event of the year for Washington media and gives presidents a chance to show a lighter side.

"I'm not going to attack any of the Republican candidates. Take Mitt Romney; he and I actually have a lot in common," the president said, telling the crowd of Hollywood celebrities and Washington power players that both men trailed their wives in national opinion polls.

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Nicholas Kamm / AFP - Getty Images

Celebrities at the annual gathering include Reese Witherspoon, who showed off her baby bump; George Clooney, who had a big a laugh; and more.