Jenner's reaction to former Olympian Bruce's big TV reveal, which aired in America last month (Apr15), will feature on an upcoming two-episode special of Keeping Up With the Kardashians, and in a teaser released on Monday (04May15), Kris is clearly struggling to come to terms with the news her ex-husband is becoming a woman.

As Kim tells her mum, "He has to deal with this for his entire life... You really have to let go", Kris responds, "I have these memories of this life and I feel sometimes like it didn't exist."

Keeping Up with the Kardashians: About Bruce will air on 17 and 18 May (15). An eight-part docu-series chronicling Jenner's transition and life afterwards will premiere in July (15).