Now Playing: Miley Cyrus on the Mend After Hospital Stay

Now Playing: Miley Cyrus Gets Candid About VMAs

Now Playing: 'The Bachelor' sneak peek: Former Miss USA competitors battle over Colton

Now Playing: Prince Philip reportedly spotted back behind the wheel

Now Playing: Family issues emotional plea after mom's mysterious disappearance

Now Playing: Airbnb customer says he found hidden cameras in the place he was planning to stay in

Now Playing: What can football fans expect in the NFL's Championship matchups?

Now Playing: Impressive 11-year-old boy genius starts first semester in college

Now Playing: Pepsi is giving a sneak peek of Super Bowl LIII commercial

Now Playing: Trump makes big announcement about border wall and shutdown

Now Playing: Deadly winter storm blasts the Northeast with snow and ice as the Midwest digs out

Now Playing: Outrage over viral video of encounter between teens and Native Americans

Now Playing: Stranger accidentally invited to bachelor party

Now Playing: Ariana Grande's best friends featured in her new music video for 'Seven Rings'

Now Playing: Midwest slammed with winter snow and ice

Now Playing: Illegally tapped pipeline goes up in flames

Now Playing: Jason Van Dyke sentenced to 81 months in prison for the murder of Laquan McDonald

Now Playing: Trump promises major announcement as government shutdown enters Day 29

Now Playing: Democrats pledge to get to the bottom of Buzzfeed report

Now Playing: Winter storm threatens travel over long holiday weekend