The newlyweds – currently enjoying their honeymoon following their Las Vegas wedding – are considering giving a home to a child from Haiti who has been orphaned by the recent earthquakes.
Cage-fighter Alex, is worried he may not be able to have children as he has reportedly been told by medics he has a low sperm count.
A friend of Alex's told the Daily Star newspaper: "He has always joked that he worries he may not be able to have kids.
"He was with his ex Marie for years and they never used protection when they had sex. We all hope it's not true because he would make an amazing dad."
Katie – who already has three children, Harvey, seven, Junior, four, and Princess Tiaamii, two, from previous relationships – has claimed in the past she would consider adopting.
The 31-year-old star – whose ex-husband is Peter Andre - said: "I saw a documentary on TV about kids abandoned in Bulgaria and it affected me because they all have disabilities.
"They are either blind or have learning difficulties and their parents don't want them so they abandon them. I think about adoption every day, but not yet."
Last night (04.02.09) it was revealed Katie and Alex, 34, wed on Tuesday (02.02.10) without signing a pre-nuptial agreement.
Friends of the glamour model have reportedly been urging her to seek a post-nuptial agreement, to protect her estimated £30 million fortune.