Sarah Hyland is worried she might swear on air at the 2014 Teen Choice Awards.

The 'Modern Family' actress has been announced as the co-host of the annual event - alongside her 'Scary Movie 5' co-star Tyler Posey - but she admitted producers will probably need a tape delay because of her foul mouth tomorrow night (10.08.14).

She told New York Daily News: ''I sometimes have the mouth of a sailor.

''That's my only concern ... [But] I wanted to do it because it sounded like a lot of fun.''

Meanwhile, Sarah doesn't expect to get to use the event as a chance to watch the performers - including Demi Lovato and Cher Lloyd - or reconnect with old friends because her evening might be too hectic.

She explained: ''I may be backstage the whole time and not see anybody.''

It has also been revealed that Selena Gomez will be honored at the event in Los Angeles on Sunday.

The 'Come & Get It' hitmaker will be this year's recipient of the prestigious Ultimate Choice Award, which has been won by a number of huge stars, including Britney Spears, Sarah Michelle Gellar, Justin Timberlake and Ashton Kutcher.

The 2014 Teen Choice Awards will air live on Sunday, August 10 at 8pm on FOX.