Bruce Jenner is spoiling Kendall and Kylie Jenner with gifts.

Bruce Jenner

Bruce Jenner

The 65-year-old reality TV star, who is reportedly in the process of transitioning from a man into a woman, is worried about how the change will affect his relationship with his youngest daughters and is trying to do everything he can to prove his love for them.

A source close to the 'Keeping Up with the Kardashians' star said: "He's constantly buying his girls gifts all of a sudden and everyone's worried that he's acting out or trying to buy affection.

"They are all trying to talk him into spending less, but he's doing things his way now."

The Olympic legend recently sat down with Diane Sawyer to discuss his transition on '20/20', which will air in the US next week, but Kendall, 19, and Kylie, 17, will not appear on the special.

While he is still close to the girls and his older sons, Brandon and Brody Jenner, from a previous relationship, Bruce has allegedly distanced himself from ex-wife Kris Jenner, whom he split from in late 2013 after 22 years of marriage, and most of his stepchildren, including Kim Kardashian West, Kourtney Kardashian and Rob Kardashian.

Another insider told Us Weekly magazine: "Besides Khloé, the Kardashians were not on board with his [male-to-female] transition.

"His boys, Brody and Brandon stuck by him, but Bruce feels like Kris and her girls only support him publicly to make themselves look good."