Khloe Kardashian ‘Jealous’ Of Kim’s Trim Pregnancy Figure? Star ‘Fears She Is Heavier’ It’s not a surprise that three sisters can be a little competitive, but Khloe Kardashian has taken her teenage woes into adulthood as she worries she’s fatter than her pregnant sister, Kim. The X Factor USA presenter is renowned for her taller frame than her petite sisters Kourtney and Kim, as well as her incredible curves – but Khloe is reportedly concerned that her figure is more voluptuous than her siblings’.The 28-year-old reality TV star has noticed that Kim has stayed trim since announcing the pregnancy of her first child with Kanye West in December, and it looks as though Khloe has decided to up her fitness game.“Khloé loves her curves, but wants to look more toned, so she’s working out every day, doing an hour of cardio. She’s aiming to lose 14 pounds,” a source told Closer magazine.“Khloé’s joked she’s bigger than Kim now, who’s pregnant! She laughs about it, but she’s self-conscious when she sees photos of herself with Kim,” they added.Kim has been extremely vocal about her weight worries whilst pregnant, also keeping no secret of her gruelling fitness regime by keeping her fans updated via her blog and Twitter.But others around her are reportedly worried that she’s taking her anxieties to a whole new level. “She’s still hitting the gym regularly – often twice a day – as well as taking on more and more work to keep active.””Everyone around her is concerned she’s doing too much when she should be taking it easy,” a source recently told British magazine Look.Meanwhile, both sisters have eldest sister Kourtney to keep up with, as the 33-year-old mum of two has managed to bounce back into shape after the birth of her second child, Penelope.