It has been well documented that she and two of her children have been battling Lyme Disease.

And though Yolanda Hadid's health has improved significantly, her supermodel daughter has not exactly had the easiest time with her fight.

The 52-year-old model appeared on Good Day New York on Tuesday morning as she revealed her daughter Bella has been 'struggling'.

On-the-go: Yolanda Foster appeared on Good Day New York on Tuesday morning to talk about the Global Lyme Alliance Dinner

Loved up: The 52-year-old model talked about how her daughter Bella was 'struggling' with Lyme Disease as they are pictured together with Bella's boyfriend The Weeknd

Yolanda was on the chat show/news programme to talk about the Global Lyme Alliance Dinner in the Big Apple on Thursday.

It was there where she was asked about her kids - 20-year-old daughter Bella and 17-year-old son Anwar - who are also fighting the infectious, bacteria-caused disease.

Yolanda said: 'Bella, you know, Bella is struggling. It's hard to imagine that this beautiful bright light on the cover of magazines that she could struggle the way that she does.

Opening up: she was asked about her kids - 20-year-old daughter Bella and 17-year-old son Anwar - who are also fighting the infectious, bacteria-caused disease

Revealing: Yolanda said: 'Bella, you know, Bella is struggling. It's hard to imagine that this beautiful bright light on the cover of magazines that she could struggle the way that she does'

'You know she's always tired. She could sleep for 10 hours and wake up (and say) "I'm still tired." In the younger generation it comes up like anxiety, severe exhaustion, joint pain, flu like symptoms and they just keep struggling over it.'

Though the stunning girlfriend of singer The Weeknd seems to be having a rough time with it, her younger brother has had an easier time coping with it.

The reality star said: 'My son, who has been home with me, is doing great. I think he's about 90 percent and he's very determined to get 100 percent and he does the work and does what needs to be done.'

Toughing it out: Of Anwar the stunner said: 'I think he's about 90 percent and he's very determined to get 100 percent and he does the work and does what needs to be done'

Spirit: The disease still has no cure and Yolanda's fight with it has been well documented on the Real Housewives of Beverly Hills

Shocking: On the chat/news programme she said she has been around the world and seen 106 doctors regarding her disease

The disease still has no cure and Yolanda's fight with it has been well documented on the Real Housewives of Beverly Hills as she has fought it for five years and even revealed the shocking number of consultations she has received.

The Dutch-American beauty said: 'I've been all around the world. I've seen 106 doctors, I've travelled all over the world from Korea to Switzerland to Germany, Belgium, Holland, I mean I've been everywhere.'

Yolanda's progress has definitely shown in her appearance as she looked absolutely fantastic in a sleeveless navy jumpsuit with black suede booties.

Evergreen: Yolanda's progress has definitely shown in her appearance as she looked absolutely fantastic in a sleeveless navy jumpsuit with black suede booties

Her platinum blonde locks were sideswept as she let her evergreen looks show with natural, complimentary make-up including shiny pink lip.

Bella will be among the honourees at the 2nd Annual Uniting for a Lyme-Free World Gala on Thursday.

Last year at the same charity gala, Yolanda revealed that the supermodel and her brother both had the disease when she was honoured.

She's a trooper! Last week Bella shared a Snapchat of herself with an IV hooked up to her arm as she works through the disease for her busy modelling career