Voting is currently underway across Nottinghamshire and the rest of the country to decide which party is elected to power.
Voters in Boris Johnson's west London constituency are deciding whether or not they want the current Prime Minister to hold his seat in the House of Commons.
But Johnson is at risk of losing his seat as he has a slim majority of only 5,034.
It's the smallest majority of any sitting prime minister since 1924, and Labour activists have put a lot of effort into campaigning in his Uxbridge constituency, MirrorOnline reports.
Johnson didn't even vote for himself, choosing instead to vote in Central London.
Here's what will happen if Boris Johnson actually loses his seat in the General Election 2019:
Will Boris Johnson still be prime minister if he loses his seat?
It is possible for Boris Johnson to remain prime minister even if he loses his seat.
It is likely that a loyal Tory MP in a safe seat would stand down to make way for him. He would then stand in a by-election, which he would likely win.
While there's actually nothing in the constitution that says a member of the government has to be an MP, it's arguably not politically acceptable these days.
Johnson's Uxbridge and South Ruislip seat is expected to be declared at around 4:30am.
Exit polls - which will indicate the results of the election - will be released at 10pm, once polls have closed.
The Labour candidate standing against Boris Johnson is Ali Milani. If he manages to win the seat, he will be the first person to ever unseat a UK prime minister.
