Jennifer Lopez and Neil Patrick Harris
Courtesy Neil Patrick Harris
02/15/2010 at 08:00 PM EST
Neil Patrick Harris shows his Twitter followers how he met Jennifer Lopez
, posting a TwitPic of the pop star from the set of his hit sitcom. Lopez was "really great – hot, cool, and funny" during her stint on How I Met Your Mother,
What's more, Harris says, she was "well prepared," giving him a "few pointers" – literally.