Why, men, of course!

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In another round of "Six Degrees of the Olsen Exes," Mary-Kate and Ashley are now responsible for getting new BFFs Nicky Hilton and Hills star Whitney Port together through their former beaus, according to Page Six!

Lemme 'splain.

Whitney's dating an Ashley ex, Matt Kaplan, while Nicky's been enjoying a long term relationship with Mary-Kate's ex, David Katzenberg.

Now, Matt and David became friends while on Olsen duty, so now, their current girls are enjoying a friendship as well, natch!

Will we see Nicky make an appearance on the new season of The Hills? Or is she leaving the reality TV up to her sister?