Moroccan and Monroe with parents Mariah Carey and Nick Cannon on “20/20.” (Donna Svennevik/ABC)

Or at least the backs of their almost 6-month-old heads have.

The twins — nicknamed Roe and Roc — will make their TV debut on ABC’s “20/20” this Friday, as Barbara Walters interviews their celeb parents about pregnancy and marriage.

In a very short preview clip, the diva sings a bit of “We Belong Together” — the song that played directly after Carey gave birth — to Roc while Walters cradles him. Hopefully most of the interview will be like that. Watch the clip below.