Pete Wentz thinks he is allergic to Christmas.

The Fall Out Boy rocker admitted he was worried about his health after putting up a tree in the home he shares with wife Ashlee Simpson-Wentz and 13-month-old son Bronx Mowgli.

He tweeted: "I think im allergic to the xmas tree. some kind of spruce mix, a hybrid. like a prius. ugh. (sic)"

Earlier in the day the musician admitted he didn't understand the point into going to the trouble of erecting a large tree.

He wrote: "Seriously eff a xmas tree. sweating balls right now putting it up lights and all. knowing its all just gonna end go away. kind of like life. (sic)."

Despite his grumbles, Pete has been embracing the festive spirit.

On Wednesday (09.12.09) he, Ashlee and Bronx enjoyed a chilly walk to a park in New York during a break in rehearsals for the 'Melrose Place' star's Broadway musical 'Chicago'.