Hollywood Stars Flock to Washington

well. A-list celebrities, many of them long-time supporters of the president, flocking here to the nation's capital, to help him kick off his second term in style. Take a look. ♪ Baby,... See More

well. A-list celebrities, many of them long-time supporters of the president, flocking here to the nation's capital, to help him kick off his second term in style. Take a look. ♪ Baby, you're a firework ♪ Reporter: Inauguration weekend began with some fireworks. Music's hottest names, from katy perry. I'm very, very proud to be a part of this weekend. ♪ Without you ♪ Reporter: To usher. We got another four years. Reporter: Kicking off the festivities at saturday's kids' inaugural ball, hosted by dr. Jill biden and the first lady. This is what inauguration is all about. It's about celebrating who we are, as americans. Reporter: This year's inauguration is expected to be a bit more low-key than the president's first in 2009. How does he recapture the magic the second time around? I think there's something beautiful to a recommitment to the people of this great nation. Reporter: But big names have still come to d.C. To witness history. This is a wonderful moment to celebrate. I'm going to be a fan watching the whole process. The excitement in the air is palpable. We celebrate this american president. ♪ At last ♪ Reporter: This morning, instead of serenading the first couple, beyonce will be singing the national anthem, expected to perform at various balls tonight, some familiar faces who helped the president celebrate four years ago. Stevie wonder. To will.I.Am and alicia keys. And jamie foxx, and john legend opinion along with some new faces for this president's inaugural theme, jennifer hudson and brad paisley among them. But one of the most highly-anticipated moments might not captured by television cameras. Lady gaga is expected to perform for the president's staffers on tuesday. ♪ I'm on the edge, the edge ♪ that's going to be some party, huh? It sure will be.