Hilary Duff felt ''uncomfortable'' when her ex-boyfriend Aaron Carter declared his love for her earlier this year.

The 'Chasing the Sun' hitmaker found it bizarre when the 'Crush On You' singer, whom she dated when she was just 13, publicly expressed his feelings for her on Twitter and in a string of interviews in March.

Speaking about Aaron, 26, on 'Watch What Happens Live' last night (08.10.14), she said: ''It's...ugh! I don't know. I don't know what to say about it!

''It [our relationship] was so many years ago. I literally haven't seen him ... so, it's uncomfortable.''

However, the 27-year-old beauty, who announced she had amicably separated from her husband MIKE COMRIE in January after three years of marriage, admits the initial attention from Aaron on Twitter was ''nice'' but she began to feel differently when it continued.

She added: ''It's nice to be felt.''

Meanwhile, Hilary insists she and Mike, with whom she has two-year-old son Luca, haven't filed for divorce as they are still keen to work on their relationship.

She said previously: ''We've uncoupled, for now. I mean, if there wasn't a chance for getting back [together], I think we would've filed for divorce.

''We're not putting any... I talk about this so much, I really don't want to talk about it anymore. But we are like... I just talked to him this morning! We really care a lot about each other.''