The 21-year-old model praised the 'Bad Romance' hitmaker as ''one of a kind'' ahead of her performance at the Victoria's Secret Fashion Show on Wednesday (30.11.16) in Paris, where Gigi modelled a variety of lingerie sets.
She said: ''Gaga has been a great kind of big sister to me and has given me amazing advice.
''I think she is such a beautiful person that is just set on spreading love everywhere she goes. I think that she is one of a kind, she is amazing.''
And the blonde beauty - who wowed in a stunning black lacy garment in the fashion show - felt ''honoured'' to be walking on the runway alongside her sister Bella.
She added: ''It is a dangerous thing to ask about my sister because I am going to get emotional and I just got my makeup done. But, I am so proud of her. We watched the show together as kids, I feel like every sisters around the world that watch the show, dream about being in it together one day. For Bella and I to be the first sisters ever in the show together is just such a honour and we are just so excited to be here.
''[My mother] is definitely losing her mind. I think that tonight she is a bit of a guest of honour being the mom of two in the show. I am pretty excited that she is here and that both my parents, my dad is here as well, get to see both Bella and I in the show, so it is going to be amazing.''
Meanwhile, Gigi also admitted it was ''like a dream come true'' being asked to walk for the lingerie brand for a second year.
She told Entertainment Tonight: ''I am so excited to be here. I cannot even contain myself. I have been a fan of the show since I was a kid. This is my second year but I do not think it will ever stop feeling like a dream come true. It is literally the greatest.''
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