Orlando Bloom. Miranda Kerr -- Together Again, But Not Really (PHOTO)

Orlando Bloom and Miranda Kerr reunited in Malibu Saturday ... but it appears it's all about their kid.

The former hubby and wife were with 4-year-old Flynn. They were visiting a friend in Malibu.

You'll recall there was bad blood during their divorce, especially after rumors that she got real chummy with Justin Bieber.

And who can forget Orlando taking a failed swing at the Biebs Ibiza.