Gisele Bundchen's marriage to Tom Brady has endured some "tough times".

 Tom Brady and Gisele Bundchen

Tom Brady and Gisele Bundchen

The 35-year-old fashion model has been married to the American football superstar since 2009, and has revealed that their union has not always been picture-perfect.

Gisele - who has a five-year-old son, Benjamin, and a two-year-old daughter, Vivian Lake, with her husband - revealed: "I think we've been through a few tough times together.

"I think that's when you know who are your friends and who loves you."

However, the Brazilian star said that despite their troubles, the duo have always remained supportive of each other.

She told CBS' 'This Morning': "My father always said the quality of your life depends on the quality of your relationships, and I think, no matter how challenging it was, we've always been supportive of one another.

"I think that's the most important thing you can have in life, you know? A support system and love."

This comes shortly a source close to the superstar couple claimed they are "doing great", despite rumours to the contrary.

The insider said: "They're surprisingly pretty simple people and very down to earth. Family is first on all fronts."