The rumours that Khloe Kardashian is 'four months along' with her first child by boyfriend

News that Khloe Kardashian is 'four months along' with her first child by boyfriend Tristan Thompson broke on Tuesday.

But the pair may have let fans in on their little baby secret as much as three months ago, when 33-year-old Khloe captioned a couples photo, 'Dad and mom'.

It's been suggested that she has an anticipated due date of February, though Khloe and Tristan, 26, raised eyebrows with the InstaStories post on her birthday in June.

The rumours did not come completely out of left-field, however, as it was previously reported that it won't be long before the couple take their relationship to the next level.

A source told People: 'They have talked about both a wedding and a baby. Khloe really wants a baby. She hopes it will happen soon.

'She is very happy and positive about her future and is absolutely hoping for an engagement.' 

Khloe discussed her baby plans on the season finale of Keeping Up With The Kardashians, saying: 'Tristan and I definitely talk about starting a family. He wants to have about five or six kids with me and that's lovely. We could start at one and we could grow from there.' 

Tristan welcomed his son Prince back in December during the first few months of his courtship with Khloe.

The youngest Kardashian sister is said to have been very understanding of the situation and even reportedly chartered a private jet to ensure Tristan would be able to make it in for the child's birth in Los Angeles.