Power publicist Peggy Siegal almost made a rare Hollywood faux pas.

At London’s Heathrow Airport on her way back from a wedding Sunday, she ran into two film biz pros who noticed she had — gasp! — Beverly Hills Hotel luggage tags on her bags.

“They said, ‘You’ll be ostracized from the industry!’ ” related Siegal, who’d stayed at the hotel for more than 25 years during the Oscars before the boycott over its owner, the Sultan of Brunei.

She ripped off the tags and tossed them. Luckily, her luggage wasn’t lost on the way home.