Kim Kardashian, Kanye West
Kanye West and Kim Kardashian arrive at the Givenchy Spring/Summer 2014 women's ready-to-wear fashion show during Paris Fashion WeekReuters

In a concert in California Tuesday Night, rapper Kanye West dedicated a song to Kim Kardashian, calling her "my fiancee" publicly for the first time. 

Kim Kardashian and Kanye West couldn't be happier. After having their first baby together earlier last month, the couple has now decided to take things to the next level with West proposing to the reality star on her 33rd birthday Monday.

A day after the engagement, West was back to work but it was evident that his to-be wife was the only thing on his mind. At a concert in California Tuesday Night, the rapper dedicated his song "Bounce 2" to Kardashian, referring to her for the first time as his fiancée.

"You know what song this is, right?" the rapper announced as the show started. "I want to sing this song to the birthday girl that's back there right now, my fiancee."

The song is reportedly about their relationship and West told his audience that his relationship with Kardashian has given him a second chance in life and recalls the incident when he could have lost it all earlier in his career.

Kardashian was also present at the concert with her mother. She was all smiles as her fiancé made no secret of the fact that their engagement has been really special for him.

"If you came with somebody that you love tonight, hold on so tight," he said. "What I'm trying to say is it's hard to find you."

West's proposal was a grand affair. The star, who is known to be not very subtle about expressing his love, rented the San Francisco Giants' stadium, hired a 50-piece orchestra, and paid for fireworks to illuminate the San Francisco sky.

It wasn't long before Kardashian's family members took to Twitter to announce the great news.

"Wow!!!!! Am I dreaming??!?!" Kardashian's sister Khloé Kardashian Odom tweeted. "Tears of JOY!!!!!!! Wow!!!!!!"

Kardashian's mom Kris told E! News: "I am so happy for both of my kids, Kim and Kanye. A match made in heaven."

Watch the proposal here in a video filmed by YouTube co-founder Chad Hurley.