However, despite the banter on live TV, things were strained behind the scenes.
Meanwhile Liam, 24, looked dapper in pale blue double-breasted jacket and black pants.
However, pals said the apparent shows of affection were all a stunt.
"They are trying to work things out and want to be together for Bear's first birthday which is next month but things are very strained".
"You're performing later, the song from the Fifty Shades film, it's going to get quite racy, is there a safe word?" he asked. "Big hug, big kisses, call me, I'll text you my number", she said, finishing her extra-long voicemail.
Este, who wore an eye-catching floral crown for the star-studded event matching her sisters' Danielle and Alana, playfully gestured to someone unseen, mouthing "call me" while cheekily winking to the viewers at home, as Cheryl and Liam remained oblivious.
As Liam chuckled, he threw the question to Cheryl, 34, saying: "She knows that", and as Jack stuck the microphone in her face, Cheryl replied: "Don't stop".