Rob Kardashian makes a surprise pop-up at Khloé Kardashian's 40th birthday party

Rob Kardashian stepped out of the shadows for a microsecond to make an appearance in Khloé Kardashian's 40th birthday video. The late Robert Kardashian's two youngest children always shared a special bond, and Rob brought it to light for his sister's special day.

Since withdrawing from his family's E! show, Keeping Up With The Kardashians sometime back, Rob opted for the private life but has made "voice" cameos on Hulu's The Kardashians. His latest appearance was in season 5 when Khloé asked him to be Malika Haqq's baby daddy, her best friend since 1999. Rob declined the offer.

In the Instagram Reel Khloé posted on June 27th, the birthday is shown blowing out the candles on her silvery lilac cake. Aside from Rob being one of the party guests, Khloé's grandmother, MJ Houghton, was also there celebrating. Turning forty is a pretty big deal as you continue looking back to your memories, but you're looking forward to what the next decade will bring.

Khloé included memories from years past, including a Christmas snap with her father, a handful with her kids, True and Tatum, and ones when she was just a baby. It's a heartwarming way to honor a birthday, and we can't get over just how far Khloé has come and achieved in her young life.

Get a peek at Khloé Kardashian's Wild West birthday party

On Saturday, June 29th, Khloé rounded up nearly all her family and circle of friends for her 40th birthday party. The theme was "KhloéWood," inspired by the Dollywood theme park in Nashville. Khloé and three of her sisters-Kim, Kourtney, and Kylie- are all fashioned up in denim and diamonds for the event. Khloé's outfit had cheeky cutouts and a figure-hugging corset that defined her well-worked-out body, ready to hit the dance floor.

The scenery was crafted into a Wild West saloon with neon lights and a casino. It was a rowdy good time for everyone, and there were even star-studded performances by Snoop Dog, Warren G, and Kurupt.

For refreshments, Kendall Jenner's 818 Tequila was served, and a giant cake made from Betty Crocker's Dolly Parton lineup was served. The country star sent Khloé a very special message, which brought joy to the Good American Founder.

Here's to another great and inspiring year for you Khloé!