Sofia Richie recently posted a photo of her looking sexy and sultry. Now, a new report claims Kourtney Kardashian thinks the 20-year-old model looks amazing in that sexy photo.

Richie uploaded a black-and-white photo of her on her Instagram account; she's wearing Victoria's Secret bra and thong while laying on her back in an empty bath. The model looks sexy and sultry wearing the T-shirt Perfect Shape bra and Sexy Illusions No Show Thong, matched with the brand's satin kimono. Many think the model looks stunning in that photo, and sources said Kardashian thinks the same way too.

A lot of people believe she is jealous of her ex Scott Disick's younger girl, but a source close to the Kardashian-Jenner told HollywoodLife there's no cattiness. The insider said Kardashian isn't threatened by Richie's lingerie photo, and in fact, she thinks the model looks amazing. Also, she reportedly knows how to handle her own when posting sexy photos and she is confident enough not to feel jealous despite the age gap between her and Richie.

The source further added Kardashian feels sexier and in better shape than ever, even though her 40th is approaching. The TV personality is reportedly planning a huge birthday bash and will celebrate the occasion with her family, as well as close friends. Some speculated Richie would also be invited, as it can be recalled she and Disick went on a vacation with Kardashian and all of them reportedly had a great time bonding.

This is a good sign the TV personality is at peace with her ex's relationship with Richie, and he seemed to be very settled with his girlfriend as well. Disick recently revealed he thinks Richie has always been a blessing. He said that he already distanced himself from the partying lifestyle, adding he's got older and tired doing such things. He then revealed his girlfriend calm him down and he takes her as a blessing.

Meanwhile, Riche reportedly wants to grow her brand and doesn't want to compete with Kardashian. A source close to the model told HollywoodLife that whatever she does, her boyfriend's ex was always mentioned --- even though it has nothing to do with them. The insider said Richie does not want to compete with the TV personality, and her recent Victoria Secret photo shoot has nothing to do with Kardashian as well. She reportedly wants to be known as her own woman and just wanted to get out of the "Kardashian shadow."