Sir Keir and Ms Leadbeater met with Labour supporters for a celebration in Cleckheaton earlier today, following her victory in yesterday's by-election.
In a close-run contest, Ms Leadbeater held off the challenge of the Conservatives' Ryan Stephenson, winning by a slim majority of 323 votes.
Her election means Batley and Spen remains a Labour seat, as it has been since 1997.
Here is a selection of photos from earlier today in Cleckheaton.
Her election means Batley and Spen remains a Labour seat, as it has been since 1997.