The beauty mogul filed for divorce from the rapper in February.
Kim Kardashian is still fond of Kanye West, despite their ongoing divorce.
On Tuesday, the Keeping Up with the Kardashians alum took to Instagram to share a sweet message for her estranged husband's 44th birthday.
"Happy Birthday. Love U for Life! ��", she wrote alongside a photo of the former couple on a private plane with their four children: 7-year-old North, 5-year-old Saint, 3-year-old Chicago and 2-year-old Psalm.
Kardashian also celebrated the rapper's birthday by sharing several snapshots of him on her Instagram Stories, including a childhood photo of West, one of just the two of them and another of him with their kids.
The beauty mogul and the "Through The Wire" hitmaker began dating in 2012 and tied the knot in 2014. Kardashian filed for divorce in February, after six years of marriage, citing irreconcilable differences.