The blonde beauty has not yet received an invitation to the Playboy founder's nuptials to Crystal Harris - which are due to take place on June 18 at the Playboy Mansion - and though she wants to watch her ex-boyfriend tie the knot, she is now considering making alternative arrangements for the day.
She told 'E! News': "If I don't get a save the date, I have another wedding to attend that same day. I got a save the date from one of my closest friends for that date.
"I'm planning on going to Hef's but I haven't gotten the save the date for that same date. I'm getting kind of antsy because I need to pick which wedding to go to."
Meanwhile, Crystal, 24, has been preparing for her big day, for which she is planning a "romantic" silver and white theme.
Wedding planner and Playboy publicist Kellie Olisky said: "We want to have everything very muted - on the tablecloths, silver and white, and maybe a blush underlay. That way, it stays very romantic."
The colour scheme is inspired by the dress Crystal plans to wear - a blush-pink strapless mermaid gown designed by Romona Keveza - which was sent to Beverly Hills bridal boutique Panache especially from New York.
Kendra - who moved out of the Playboy mansion then married NFL player Hank Baskett in 2009 - is not the only ex-girlfriend of Hugh, 84, to be upset by his wedding plans.
Holly Madison, one of Kendra's co-stars on the reality TV show, was said to be shocked to find out Hugh was to marry, as his intention not to marry caused their break-up in 2008 and later confronted him about his decision.
Speaking of their meeting, she said: "It was definitely awkward, but good. A lot of people congratulated him on Twitter, but for me, it was such a personal thing. I wanted to go there."