The 21-year-old actor's life has changed dramatically since he was cast as Spider-Man/Peter Parker in the Marvel movies.
Holland said he was delighted to be able to share his new lifestyle with his childhood friend, reported Contactmusic.
"I had my best mate, Harrison, with me through all this and having him with me has been my touchstone to reality," Holland said.
"He was on payroll as my assistant, but it was just a way to have my best mate with me through this journey, to enjoy it with him and have that same excitement and buzz we would have had as kids, going through an experience like that.
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