Khloe Kardashian is ''obsessed'' with her niece Chicago West.

The 'Keeping Up With The Kardashians' star - who is expecting her first child with her partner Tristan Thompson - loves being an auntie to Kim Kardashian West and Kanye West's youngest daughter, who they welcomed via a surrogate last month.

A source told People magazine: ''She is obsessed with baby Chi and visits every day ... Khloe's doing great. She can't wait to be a mom. She is excited about being pregnant, but can't wait to meet her baby. She is also excited about her upcoming baby shower.''

Meanwhile, Khloe previously admitted that her pregnancy has been ''physically and mentally trying'' for her but praised her partner Tristan for making everything ''as easy and beautiful as it can be''.

She said: ''Having a partner that is equally as excited as you are, and is such a support system, is crucial! Tristan has been an angel to me! This process is trying - physically and mentally - but Tristan has made everything as easy and beautiful as it can be! More than I could have imagined.''

It was Tristan who twigged that Khloe was pregnant first.

Writing on her website, she added: ''Tristan was the one who kept telling me, 'I think you're pregnant!' He was leaving town to go back to Toronto and I went to get a pregnancy test. I actually had to FaceTime him to tell him. I was nervous and he was so excited! Of course, it's such a blessing and such an exciting thing - but I do believe your initial reaction is always nerves. I'm so blessed that Tristan has been beyond supportive! He's helped me overcome any fear or anxiety that I have! He's always so reassuring and confident about everything when it comes to our baby.''