The 28-year-old beauty was dating the 'Glee' star when he tragically passed away at the age of just 31.
She wrote: ''I know you would want us all laughing and smiling today..
''So we think of you and remember all the laughter and joy we shared together. I hold you in my heart always and love and miss you so... (sic)''
Meanwhile, the former couple's co-star Kevin McHale previously revealed he felt as though 'Glee' never recovered following the death of Cory, who played lead character Finn Hudson in the show.
He said: ''When Cory Monteith died, I don't think the show ever came back from that.
''It wasn't for a lack of trying ... I think after that the vibe onset is different. It was just weird for us being there never mind actually filming.
''Being one of the writers in that sort of situation I wouldn't know what I would've done because I was like, 'I don't even really want to be here.'''
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