Jimmy Fallon's infamous tween Sara - "with no 'h,' because h's are EW!" - has returned to The Tonight Show. This time she's brought her friend, fellow tween Gabby from L.A., played by none other than Jennifer Lopez.

The two show off their twerking talents, indulge in In-N-Out burger, and - horror of all pre-teen horrors - discover that both of their dads have joined SnapChat.

Lopez returned to scripted TV last month with the premiere of Shades of Blue on NBC, in which she plays a detective and mother who becomes entangled in a web of police force corruption. Variety reports that the series' ratings started strong, and remain so in part due to the inclusion of delayed viewing. The show was already renewed for season two.

Lopez also serves as a judge on American Idol, which is currently in the midst of its farewell season.