Kourtney Kardashian won't let Scott Disick have ''split custody''.

The 'Keeping Up With The Kardashians' star is reportedly planning to deny her former partner - with whom she has Mason, five, Penelope, three and Reign, nine months - equal access to their children as she doesn't think he's ''fit to be a parent without supervision''.

A source said: ''Kourtney really seems finished with Scott this time. Everything is getting finalised [but] there is nothing in writing yet.

''However, Kourtney won't allow Scott split custody. She thinks he is a drunk mess and not fit to be a parent without supervision.''

And whilst the 36-year-old television personality doesn't find it ''easy'' being a single mother, the insider claims she is used to it.

They added: ''She will only agree to supervised and limits visits. Although being a single mom is not easy, Kourtney is used to taking care of the kids by herself. She has them on a great schedule and everything runs smoothly even when she is alone with them.

''She had some nanny help, too, since she is working, but she spends as much time as possible with the kids. They are her world and she loves being a mom.''

Kourtney also keeps a close eye on the 32-year-old model but refuses to get upset by his ''latest shenanigans''.

A source told PEOPLE magazine: ''She keeps an eye on Scott via social media and has come a long way and instead of getting upset about Scott's latest shenanigans, it helps her realise splitting was for the best.''