Mila and Ashton then reconnecte, and originally had planned to keep their relationship as a simple hook up, before realising they had feelings for one another.

Meanwhile, Natalie Portman spilled on who is the better kisser between Ashton and Mila.

'Mila!' she revealed on Watch What Happens Live without a moment's hesitation. 'I mean, obviously!'

Host Andy Cohen pointed out she had worked with Ashton in 2011's No Strings Attached and his wife the year before in Black Swan.

But Natalie knew exactly where his question was going, finishing for him with a smile: 'I kissed them both.' 

Mila and Ashton first met when they starred together on That 70s Show from 1998 to 2006, where a then 19-year-old Ashton was Mila’s first kiss...although she was just 14.