Plus, how we secured that cameo from two OG franchise stars, and how the Super Mario Bros. theme was once part of Anderson's jazz scat.

As the costars promoted crime-spoof sequel The Naked Gun, they have been "enjoying each other's company," continued the source. Neeson and Anderson have exchanged sweet kisses on the cheek on red carpets, and recently puckered up to apply Anderson's Sonsie lip balm while on Watch What Happens Live with Andy Cohen.

Pamela Anderson and Liam Neeson’s connection was caught red-handed. “Naked Gun” co-writer Doug Mand revealed the model, 58, and actor, 73, had an instant bond while filming the new action comedy. The writer told The Hollywood Reporter on Tuesday that he is “getting more texts about what’s going on with them than anything else.”