Ashley and Mary-Kate Olsen
05/17/2013 at 01:05 PM EDT
and Ashley Olsen
They're fraternal twins – but you wouldn't know that based on Thursday night's New York Knicks vs. Indiana Pacers game at New York's Madison Square Garden.
The sisters showed serious solidarity in the stands, with cheering moves so synchronized, 'N Sync of the late '90s would have been jealous.
Their show of support helped out the home team: The New York Knicks ended up beating the Indiana Pacers 85-75, keeping the Knicks alive during the NBA Eastern Conference Semifinals.