Actress Mischa Barton and her boyfriend CISCO ADLER insist they are not engaged, despite recent rumours.

THE OC star and her rocker beau have only been dating for five months, but have been plagued by rumours of impending nuptials.

Adler says, "It (an engagement) is not true. The love is young!"

The Whitestarr lead singer wears a lock necklace that only Barton has the keys to, which she wears around her neck.