The couple — who are nearly 50 years apart — are reportedly planning on tying the knot during the US summer.
A source told Radar Online, "They consider each other soulmates and freely admit they couldn't imagine a life with anyone else at this point."
They added that the couple plan to say "I do" this summer near Cait's Malibu mansion with a handful of close friends and family members.
But don't expect the Kardashians to get an invite. "This is a dream come true for Cait because her rejection by the Kardashians — and even her own daughters — had left her feeling isolated and suffering from a crippling depression. Sophia has changed all that."
Not to mention, the Kar-Jenner clan doesn't exactly approve of her new leading lady. In December, a source told Life & Style exclusively that Caitlyn's daughters Kylie Jenner, Kendall Jenner, and Kim Kardashian were upset about their relationship. "They've heard from friends that Caitlyn's dating Sophia, and it upsets them like you wouldn't believe." They continued, "She's their age! They feel a mix of jealousy and distrust about it."
Although Caitlyn would have loved to help her other daughter, Khloé Kardashian, through the tough time in the delivery room, the Kardashians have "kicked her out of the family," Radar's source said.
In fact, Koko even hinted back in February that her former stepdad wouldn't have a relationship with daughter, True. When asked whether her pregnancy has affected her relationship with Caitlyn, the 33-year-old told the UK morning show, Lorraine, "I don't think it affects anything with Caitlyn. Things are just as they are." Ouch.
Regardless of their opinions, Cait has moved on. The two have reportedly been shacking up for months and were photographed together just last week looking happier than ever. "She and Sophia have a lot in common," said the source told the site, before adding, "The age difference doesn't seem to matter at all."
This story was originally published on our sister site, Life and Style Magazine.