Khloé Kardashian's daughter True Thompson, whom she shares with ex Tristan Thompson, turned 4 on April 12

"I got you for life," aunt Kim Kardashian wrote in her tribute to True

Khloé Kardashian's daughter True Thompson, whom she shares with ex Tristan Thompson, turned 4 on April 12

Khloé Kardashian's daughter True Thompson, whom she shares with ex Tristan Thompson, turned 4 on April 12

Khloé Kardashian's daughter True Thompson, whom she shares with ex Tristan Thompson, turned 4 on April 12