That a supposed Muslim sister, under the guise of selling her wares, openly fraternizes with one of the mufsidoon fil-ard (corrupters on earth) is a munkar that must not be allowed unchecked. Such an act goes beyond mere optics, it is a dangerous attempt to normalize evil, whether the woman involved realizes it or not.
She should not hide under the pretext of “marketing” or any other excuse to justify such an act. We are certain that if it were a Baba Sango who approached her, she would not want to be seen with him.
'A person will only be with whom he loves' says an authentic hadeeth. 
For Allaah's sake, why will a Muslim woman love a hip-pop star? 
A Muslim woman is an honoured being. She is expected to be seen only in honourable places, carrying herself with dignity. She is expected to be modest and bashful, for that is what is best for her.
Modesty! Modesty! Modesty! O Muslim woman.
 الْحَيَاءُ لَا يَأْتِي إِلَّا بِخَيْرٍ
“Bashfulness does not bring anything except goodness.”
[Al-Bukhārī (6117), Muslim (37)]
A woman fidgeting, swaying, or modelling in front of men other than her husband is far from modesty. (I am not referring directly to the case in question, but she was a step away from that.)
 فَلَا تَخْضَعْنَ بِالْقَوْلِ فَيَطْمَعَ الَّذِي فِي قَلْبِهِ مَرَضٌ وَقُلْنَ قَوْلًا مَعْرُوفًا
“So do not be soft in speech, lest he in whose heart is a disease should be moved with desire; but speak in an honourable manner.”
 [Surah al-Aḥzāb, 33:32]
A man with a diseased heart, as all the musicians are, can easily be aroused by a woman’s tone or gestures, even by mere imagination.
Only Allaah knows the evil that can arise from such the kind of meeting in question. 
Of course, there will always be supporters of munkaraat, brazen and surreptious. We have already been seeing some 'intellectual minds' writing nonsense to justify the rubbish. We know many will still come out of their shells. 
I have always observed that many of these brothers who justify the 'waywardness' in some of these social media Muslim ladies can't allow it for their wives and daughters. 
Can you, O 'intellectual' brothers, allow your wives or daughters film themselves as they sell their wares to, let's say, Portable Zaazuu? 
Or will you say this particular musician in question is more decent than Zaazuu so you can allow your wives and daughters do the same with him? 
I know you won't, but why allow and justify it for other women? You are being selfish and evil the same time. 
We are an Ummah that must not allow munkaraat to thrive among us, even when they appear to gain acceptance.
And when you strive to correct evil, there will always be a force ready to oppose you. Do not be discouraged, continue to correct the munkaraat.
If the present generation does not appreciate your efforts, their progeny will, just as the descendants of those who once opposed the forbidders of evil now appreciate their stance.
Allah, the Mighty, said:
 وَالْمُؤْمِنُونَ وَالْمُؤْمِنَاتُ بَعْضُهُمْ أَوْلِيَاءُ بَعْضٍ ۚ يَأْمُرُونَ بِالْمَعْرُوفِ وَيَنْهَوْنَ عَنِ الْمُنكَرِ وَيُقِيمُونَ الصَّلَاةَ وَيُؤْتُونَ الزَّكَاةَ وَيُطِيعُونَ اللَّهَ وَرَسُولَهُ ۚ أُولَـٰئِكَ سَيَرْحَمُهُمُ اللَّهُ ۗ
“The believing men and believing women are allies of one another; they enjoin what is right and forbid what is wrong, establish prayer, give zakah, and obey Allah and His Messenger. Those – Allah will have mercy upon them.” [Surah at-Tawbah, 9:71]
The Messenger of Allah ﷺ said:
 وَالَّذِي نَفْسِي بِيَدِهِ لَتَأْمُرُنَّ بِالْمَعْرُوفِ وَلَتَنْهَوُنَّ عَنِ الْمُنْكَرِ أَوْ لَيُوشِكَنَّ اللَّهُ أَنْ يَبْعَثَ عَلَيْكُمْ عِقَابًا مِنْهُ ثُمَّ تَدْعُونَهُ فَلَا يُسْتَجَابُ لَكُمْ
“By the One in Whose Hand is my soul! You must enjoin what is right and forbid what is wrong, or else Allah will soon send upon you a punishment from Him; then you will call upon Him, but He will not respond to you.” [At-Tirmidhi (2169), graded ḥasan]
Fathers of daughters, husbands of wives, and brothers of sisters must keep watch over the women under their care.
Being a dayyūth, a man careless about the affairs of his wife or the women under his charge, is a grave sin in the social laws of Islam.
Allah the Mighty said:
 وَاتَّقُوا فِتْنَةً لَا تُصِيبَنَّ الَّذِينَ ظَلَمُوا مِنكُمْ خَاصَّةً ۖ وَاعْلَمُوا أَنَّ اللَّهَ شَدِيدُ الْعِقَابِ
“And fear the Fitnah (affliction and trial) which does not affect only those who do wrong among you, and know that Allah is severe in punishment.” [Surah al-Anfaal, 8:25]
Al-Imaam As-Sa'dee, rahmatullaah alayhi, said in the Tafseer of the Verse:
'Meaning: the trial will not afflict only the wrongdoers among you, but also others, when evil appears and is not changed, it's punishment becomes widespread. This fitnah is repelled through forbidding evil and suppressing the people of corruption, not allowing them to commit sin or injustice as much as possible, know that Allah is severe in punishment upon those who expose themselves to His wrath and abandon His pleasure.' End of Qoute. 
Aboo Aamir, Ibadan, Nigeria. 
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